I had a similar thought. The dish is big enough to drink out of (which as you know is all they need), but with her sitting on top of it like that it tells me she's either looking for more humidity or a way to cool herself down.
I think a quick check on the husbandry basics is in order just to rule those out. It could always be that she's just being a silly snake, but it never hurts to make sure.
Best regards,
Eric
EDIT: To answer the original question, the best I can do is say she's a clean looking Lesser.![]()