You don't have to ask a provider permission to write a review. Some hobbyists do ask before writing one, but it is not necessary. The exception is if a lady specifically says she does not want reviews, then you should honor her wishes unless there was something bad (bait and switch, upsell, really bad service etc) that you feel you should share with other hobbyists.

It is totally up to you if you want to ask her first, or if you just want to submit it, and then inform her after it is approved, or just submit it and let her discover it herself.

Your lady in question already has reviews here, so you will just be adding to her reviews. If she had none, then you would be creating her profile and submitting the first review.

http://www.theeroticreview.com/reviews/show.asp?id=193721

and then honor her choice. When I do write a review, I send it to the woman before i hit submit so that she can see it first and give me feedback.
first for her feedback.