No experience of her, sorry.
A burn scar would not put me off and the feedback is disputed anyway. It was made by a profile that appears to have been created just for that feedback. Feedback left 15th May, user not logged in since 19th May, no other feedback left for anyone, good or bad.
My comments are (a) she looks fit enough otherwise (b) how long do you spend looking at her face anyway (c) I don't see why it would affect her performance. I agree she is bit expensive for a vanilla list of services but it seems to be a sellers market in the area once you ignore all the fake and skank profiles!