1) Of course you should agree with her request. No point in upsetting a good escort. Say 'not really heard of that site much, so no interest in it' or similar.
2) Then post the review after a few weeks with enough details changed so she wont know it was you.
All reviews add value. We all need to give back. We certainly can't stop reviewing because escorts tell us.
The one thing I can agree is not mentioning extra services. If, say, she does not offer anal on her likes, and did anal with you, it could be wise to not mention that. If for no other reason than maybe this would identify you.
Oh and clearly if the next time you meet, she asks you if you reviewed her, here are three things to do: deny, deny, deny.