If she tries to reconcile with her sister but she does not accept it, will Allaah accept her deed?
Question

                My sister is not speaking to me after we had an argument in which she was in the wrong. But I still spoke to her and greeted her with salaam, but she told me, I do not want to speak to you. Does it mean that my deeds are not accepted?.
Praise be to Allah.
    If the argument was not caused by you and you have tried to 
    uphold ties with her, and she is the one who refused, then there is no sin 
    on you, but you should carry on trying to uphold ties with her and treating 
    her kindly as much as you can, and ask Allaah to reconcile between you and 
    protect you from the tricks of the shaytaan. 

    Muslim (2565) narrated from Abu Hurayrah (may Allaah be 
    pleased with him) that the Messenger of Allaah  (peace and blessings of 
    Allaah be upon him) said: “The gates of Paradise are opened on Mondays and 
    Thursdays, and every slave who does not associate anything with Allaah is 
    forgiven, except a man between whom and his brother is some grudge. It is 
    said: Wait for these two until they reconcile, wait for these two until they 
    reconcile, wait for these two until they reconcile.” This is an important 
    hadeeth that points to the seriousness of severing ties and bearing grudges, 
    and shows that they are impediments to forgiveness. 

    Ibn Raslaan said: It seems that if one of them seeks to 
    reconcile with the other but he does not accept it, the one who seeks 
    reconciliation will be forgiven. End quote from Sharh al-Zarqaani ‘ala 
    al-Muwatta’ (4/335). 

    Al-Bukhaari (6237) and Muslim (2561) narrated from Abu Ayyoob 
    (may Allaah be pleased with him) that the Prophet  (peace and blessings 
    of Allaah be upon him) said: “It is not permissible for a Muslim to forsake 
    his brother for more than three days, each of them turning away from the 
    other when they meet. The better of them is the first to greet the other 
    with salaam.” 

    Ibn ‘Abd al-Barr said: They differed concerning two who 
    forsake one another and one of them greets the other with salaam – does that 
    mean that he is no longer forsaking him or not? Ibn Wahb narrated that 
    Maalik said: If he greets him with salaam then he is no longer forsaking 
    him. It is as if – and Allaah knows best – he based this on the words of the 
    Prophet  (peace and blessings of Allaah be upon him), “The better of 
    them is the first to greet the other with salaam.” 

    Abu Bakr al-Athram said: I said to Ahmad ibn Hanbal: If he 
    greets him with salaam, will that be enough with no further need to speak to 
    him? He said: That depends on whether he used to do that before he forsook 
    him. If it is known that he used to speak to him then merely greeting him 
    with salaam does not mean that he has stopped forsaking him, unless it is a 
    kind of greeting that is not immediately followed by turning away. 

    Something similar was also narrated from Maalik. It was said 
    to Maalik: A man forsakes his brother then he greets him first without 
    speaking to him any further. He said: If the other man is not causing any 
    offence to him, then that is not sufficient to end the rift unless he speaks 
    to him and lets go of the reason why he forsook him. End quote from 
    al-Tamheed (6/127). 

    Al-Nawawi said in Sharh Muslim: “The better of them is 
    the first to greet the other with salaam” – this is the evidence for the 
    view of al-Shaafa’i and Maalik and those who agree with them, that the 
    greeting of salaam ends the forsaking, and removes sin from the person. But 
    Ahmad and Ibn al-Qaasim al-Maaliki said: If he is still causing him offence, 
    then the greeting does not end the forsaking. End quote. 

    To sum up, the fact that you greeted your sister and spoke to 
    her means that you are no longer guilty of the sin of forsaking and severing 
    ties. We ask Allaah to accept good deeds from us and from you.  

    And Allaah knows best.