Alright temps aside. I doubt temps play into this.
I had a 250g girl give me the cold shoulder for over two months too.
Leave her alone, give her a tiny hide and give her a regular sized hide wih some paper in it.
Dont straighten anyhing and let her move stuff around how she wants it, just clean the pee and poop and thats it.
Fill her tub up or downgrade to a smaller tub.
Fuzzies, live fuzzies will work. When you have a picky brat.