Incest role play or age-play typically from my observations.
Yes I think that is the gist though it's obviously very niche and most girls wouldn't entertain it, where girls do openly advertise it they are often higher priced due to the niche nature of what they are offering, I guess it's supply and demand.
Rape play or forced sex is another taboo that i've seen on a couple of profiles though I believe that AW have in the past removed some profiles that make direct reference to age play and rape so girls get round it by advertising "Taboo" and "Consensual non consent"
I did book a girl around 5 years ago who advertised skoolie role plays and thought she would just wear a uniform but on the way to the punt she started texting me asking if I wanted her to be a teacher or a relative.

I almost cancelled the punt as I started to wonder WTF I was walking into and i'd always have concerns booking a girl with this sort of thing on her profile in case I was being set up etc
As for this girl i'm not sure she is suitable for age play as she advertises AW age as 44 so more like 50 in real years, even most of the UKP punting crew would be hard pressed to have an imagination vivid enough to get off on age play with this one