Welp, I don't know if this gets better or not, but I am having to stretch my suspension of disbelief too far in the setup of this. If there was a more believable setup for everyone starting to doubt that she was the legitimate daughter, sure, but here it's pretty much, "the new girl no one knows is nicer to us and looks like the father, lets believe she's the real daughter despite the other girl having been here since she was born, she must be a fake!"