I don’t remember much but the MC had special powers and she is adopted. Her mom adopted her because she was lonely because she had to leave her sons and the dad because the grandpa? didn’t accept her. So the 3 brothers don’t accept her at the beginning because they think she took their mother’s love. Everyone thinks the MC is crazy because she speaks a lot of nonsense but it’s all real and it’s related to her special powers?
I dunno, sounds similar to Beware of the Brothers, but I don't recall there being special powers or a grandpa in that one.