I'm gonna disagree with the rest and play devils advocate

1. should i book her and what can i expect from her when i see her during that session?

Fuck yeah! There's nothing quite like the intense primal raw animalistic feeling you get from make up sex.

2. what did she mean by "she will get back at me"? what can i expect?

She has developed strong feelings for you bro and feels betrayed by your proclivities and promiscuous behaviours. She will get back at you by raw dogging the next bloke and/or giving them extras that you haven't been able to get from her - so when the next bloke posts an AR detailing all the extras he received from this chick, it will make your blood boil and fuck you up mentally.