Ere... Ask!
+1 - I contact her either via AW e-mail or txt depending. If by e-mail I do a quick introduction, explain when I want to book her, and tell her exactly what I want to do - e.g. 2 hour GFE with DFK, OWO, RO, 69, Various positions eg cowgirl/doggie/mish etc, CIM / COF to finish and ask her to confirm possible times and that all of the above is fine.
Once she confirms, on AW I always then follow-up with a booking which has exact same list of items she has already confirmed in the subject line. E.g.
"As discussed - confirming 2 hour GFE with DFK, OWO, RO, 69, Various positions eg cowgirl/doggie/mish etc, CIM / COF to finish."
It's not necessarily a formulaic to-do-list as I do play it by ear on the day but these are (generally) the minimum services I expect from a WG whether I choose to partake of each service or not.
So far I have never had a WG confirm a booking made like this and then later try and deny a specific service.