text: Leanna Norris (pictured during her trial) admitted killing her young daughter . A mother who drugged her young daughter with allergy medicine before smothering her to death has been jailed for 37 years. Leanna Norris, 25, of Auburn,  plied two-year-old Loh Grenada with Benedryl to make her sleep before by covering her mouth and nose with duct tape and a blanket, a court heard. The body was found in the front seat of her car in Stetson, Maine, on June 24, 2013. Assistant Attorney General Deb Cashman said Norrishad committed the murder to stop her ex-boyfriend, the father of her child, dating other women. 'She did not want (his new girlfriends) mothering her child,' reported the Bangor Daily News. Norris wept as she told the Judge: 'I want it to be known that I'm sorry to everyone that I have hurt,' reported the newspaper. 'All I ever wanted was for her to be safe and us to be together forever.' The court heard that Norris had suffered from mental health problems including depression, and had tried to commit suicide after she killed her daughter. But Superior Court Justice Ann Murray had rejected Norris' insanity defense and found her guilty. Norris admitted to investigators that on the evening of June 23, 2013, she drove her daughter, Loh Melody Grenda, to Durham Bridge Road in Newport and gave her three times the normal dose of an antihistamine. She put duct tape over the girl’s mouth and nose, then smothered her with a blanket so she would not have to watch her die, according to the trial testimony. The mother then drove to a cemetery in Stetson and took the rest of the antihistamine and swallowed 200 Advil pills in a suicide attempt. Norris told police that she had broken up with Loh’s father and he had threatened to try to get sole custody of the girl. Norris, 25, had drugged two-year-old Loh Grenada (pictured) then covered her mouth and nose with duct tape . Cowardly act: The court heard that Norris allegedly had covered her daughter with a blanket while she smothered her so she 'would not have to look at Loh's eyes' Martha Harris, who is representing Norris, told the courtroom that her client was depressed and had both anxiety and mood disorders last year, according to the newspaper. Norris' ex-boyfriend Michael Grenda, who was the father to two-year-old Loh Grenda, testified about the parents' estranged relationship, according to the newspaper. His testimony reportedly included that the couple's verbal disputes led to police being dispatched on multiple occasions -- and though Grenda broke up with Norris on June 16, 2013, the two agreed to stay and parent in the same residence. Norris' digital communications with different men stopped a potential reunion, he also said, according to Bangor Daily News. Grenda reportedly recounted his telling Norris on June 23 'that was the end of everything' - and then 'She became very upset. She was crying and smashing her head against the wall.' The 27-year-old's testimony also reportedly revealed that Norris cooled off that morning through his help, he left the home in the afternoon, and found out what happened to Loh Grenda on June 24. Suicidal: Leanna Norris allegedly asked for a gun after her daughter's death in order to take her own life . Testimony: Assistant Attorney General Deb Cashman said Norris knowingly committed the murder and 'did not want Mike dating other women and did not want them mothering her child . The suspect's father Steven Norris said he received a 2.27am phone call on June 24 from his daughter, in which she admitted to killing Loh. He then contacted the authorities while Norris was one the phone with her mother. Norris later turned up at her parents' home with the dead body inside the car. He told the court she had been feeling suicidal and had asked for a gun, according to the Bangor Daily News. Her affidavit by Maine State Police Detective Thomas Pickering said she offered 'two or three syringes of Benadryl to make [Loh Grenda] go to sleep.' 'Leanna Norris put black Gorilla [duct] tape on Loh Grenda's mouth and nose; that Leanna Norris put a blanket over Loh Grenda's face so she would not have to look at Loh's eyes,' the affidavit reportedly said. ' Leanna Norris said that she killed Loh Grenda; that Leanna Norris put her hand over Loh Grenda's face and suffocated her.' Judge: Superior Court Justice Ann Murray is pictured at the bench during the trial at Penobscot Judicial Center, Bangor . Assistant Attorney General Leann Zainea appears for the prosecution (left) across from defense attorney Martha Harris (right) Norris said she took the tape off 'so it would not look so horrible', the affidavit is said to reveal. Later at a Stetson cemetery was 'where [Leanna Norris] took pills and put tape on her face in order to kill herself,' the affidavit also reportedly said. But, after vomiting, the 24-year-old allegedly called her father, Steven Norris, and then drove to his house, where he discovered his granddaughter dead under a blanket. Norris, who had asked to be tried without a jury, had told the judge that she didn't set out to kill her daughter and her defense asked for the minimum sentence of 25 years. But Mr Grenada, Loh's father, had branded the request 'a joke' and recommended a 45 term for the 'premeditated' killing. Justice Murray sentenced Norris to 37 years in prison after taking into account the child's suffering and her mother's mental illness.
target: Leanna Norris admitted killing her  daughter Loh Grenada, 2, in June 2013 .
  She plied the toddler with Benadryl and duct-taped her mouth and nose .
  Court heard 'depressed' Norris didn't want Loh's father dating other women .
  25-year-old entered  insanity plea but was sentenced to 37 years in prison .