What I have found so far is that, quite often the girl will significantly reduce their rate when they are off or on holiday. If she is off or on holiday, the rate does not really matter for her as she is going to take booking anyway.
Once she is active she will put back her normal rate again.
Advantage of doing this it might be (at least imho based on the girl POV?), her profile will appear when people are searching based on maximum price, her profile will come up and people could see how she looks like and might save the profile for later booking.
This girl meet this criteria based on this
Last Login: 16/04/2015
Phone No.: No Phone number (e.g. she will not pay any maintenance fee to AW).
It suggests that she is not active at the moment....
Another possibility is PG scam, we could see if this was the case once the PG galleries start to appear.
While you still get £50 an hour in London, £35 an hour does not exist ....
Also like other member said, it could be a revenge profile, for instance to revenge to her boyfriend cheating her, etc.... In the pioture she shows her cute face and the surrounding setting is not the one that will generally suitable for AW profile.