When you first got her, she was probably calm and 'tame' because she was freezing cold. Since you've warmed her up slightly, she's active enough to be pissed off that her temperatures and house are not comfortable for her.

It really doesn't cost much to set her up properly. A cheap thermostat runs you at about $30 (http://www.amazon.com/Hydrofarm-MTPR...pr_product_top), two hides made from plastic planters with a hole cut in the side will be maximum $4, depending on what size you get (http://www.homedepot.com/Outdoors-Ga...&storeId=10051), and you can find UTH's on Craigstlist for around $10. Even brand new from pet stores, they're only $20.

I'm sure you can scrounge up $50 or so for your girl