smick, I do not mean to insult you at all here I just know that this happened in my family when my siblings came home from seminary.
They acted like they were frummer than the rest of the family, that they had to “pasken” all of our sheilos and that we had to change the way we do everything in our house because we do it ‘wrong’. I don’t know if you’re doing this but if you are, that might be the reason she is acting strangely to you. I could totally be off base here but just something to think about.
Good luck and hope it all works out!!!