Milk snake was biting enclosure

[nich0lai]

I caught a decent sized milk snake in my bedroom that was way too skinny so I kept her for a month and fed her got her fat again and was debating releasing her (This house kills snakes, I try to rehab as many as I can, I caught three this month already, one was almost doa =(). She is completely docile. Never struck or musked. Took food on the first try. Doesn't love being handled but doesn't bite, just runs.

I changed cages to a clear one, for a few days she was fine, fed her. After she came out of the food coma she spent the next two days biting at the clear plastic. I cooled her down a bit, added some hides, fed her again and I've only seen her try one more time......

Thoughts?

thanks.