Why did mama (Isabella) tell Phil "they escaped safely"? In episode 12 of The Promised Neverland. Isabella tells Phil, the smartest among the 4 year olds, that the other kids escaped safely and he did not need to worry. Did she know that Phil knows everything about the farm?

And if she did, did she suspect everyone below 4 years old?
She did suspect Phil but then after looking for the situation she concluded that
the younger kids didn't know anything. (chapter 35).
So why did she tell Phil everyone has escaped safely? That's because she already admitted her defeat (chapter 37), and with that, she had nothing to lose anymore.

 But ultimately, it's because from the bottom of her heart, she actually loves them and didn't want Phil to worry about them