My baby lavender cornsnake has regurgitation issues. I'm not sure of the cause of this. At first I wondered if I could be handling her too soon (24-36 hours after feeding) but I waited three days before picking her up this time, but she regurgitated again. She has regurgitated a total of 3-4 times since I got her in August. The mouse looked like it hadn't really gone through the digesting process yet and had greenish slime on it. Could anyone help me identify why she is regurgitating or how to stop it? Is she ill?

Thank you.

Additional info: She is kept at 80 degrees, but at night it drops to about 70. She lives in a rubbermaid container suitable for her size with carefresh natural substrate, a water bowl and a little hide.