I don't own one now but I used to. My business is now at the other end of the age range. I own a kids nursery! The guy specifically asked about London but I agree that in other parts of the UK it will be lower, down to the minimum wage of £5.52 in some places.
You should also remember that you will not be allowed to work during the first 6 months of your time in the UK but after that finding work should not be a problem, although she will probably be expected to enrole for NVQ (National Vocational Qualification) training which is "on the job" plus some spare time study. I used to bring over care assistants from the Philippines so have a little experience of this, albeit a few years out of date.