You need 2. Reason being yes she may always stay there but where else is she gonna go? She wont sit out in the open. She will choose security over anything else. She gets to hot she wont move because she feels secure there.
Also are you using a uth?
okay, i just made her a second one out of a cereal box, i will get her a real one from the store soon.. and sad too say, what is a uth?
im a noob to the snake world! but they are just so fascinating!