From your review it doesn’t look like you had a confirmed booking so a negative is a bit harsh when she cancelled on you before you had to head out.
I only give a negative if they don’t cancel and ghost me on arrival or cancel while I’m en route.
Your review, your rating but it’s harsh imo.
Neutral would be fairer.
How could she offer to
rearrange a booking she hadn't agreed to?

FYI a booking does not need to be 'confirmed' for a review to be left the rules state it has to be
agreed to and she agreed to the OP's booking then cancelled so he is entitled to post a negative review.
https://www.ukpunting.com/index.php?topic=252680.04 Reviews
A new review thread can only be created once a service provider has agreed to a booking. A meeting does not need to occur, and money does not need to change hands.
The only criterion is that she has accepted the initial booking. Members can post more than one review about an SP, but touting will result in a ban. Reviews are allowed up to 6 months ( for new members, this rule is currently relaxed to 12 months)after the event(positive or negative)
Only one sex worker can be the subject of a review, not a whole agency/establishment/ brothel. The exceptions are sex parties, duos, etc. and massage establishments where providers do not have names.
Reviews must contain a link, contact details or address (if publicised by the service provider).
The title of the review should only have SP Name - Location - (B&S / TOFTT / SCAM label if needed), and there are no abbreviations of establishments in the title of a review.