I can't remember where I saw it, but I read something about a "greenhouse effect" when there's no thermal gradient. Supposedly it's unhealthy, but I can't remember specifics. Have you heard anything to that effect, or had any issues?
I'm assuming you haven't had issues or you wouldn't do it, but I'm curious.
Glad she's eating, but if you're concerned about her investing cypress, put the prey on a paper plate.
Personally though, I've always used cypress, and never had major issues. I've had to take substrate out of hee mouth before she swallowed it, but she's so laid back... I can put my mouse smelling hands in her tank whenever. Never been nipped. Your snake could be different though.
Sent from my HTCEVOV4G using Tapatalk