From what I have seen of a few English Schools in London they do have a fair turnover of staff (pre major part of recession)
IF your Mahal has good levels of English she will also be ok in the retail sectors she may want a part time job for various reasons but firstly on first arriving in the UK its a massive shoock as the ladies say not all can deal with a full time job straight off not simply Jet lag or the weather but pace of life etc. Secondly she may need to wait for a postion to open.
Also im guessing practical experience of English is quite important as im guessing those seeking English tution would want their English tutors speaking as fluently as possible (slang is important but hard to pick up abroad).
The Wife had a good level of English on arrival and only yesterday in a Phill Cafe in London was ask if she was British born and found when speaking to the PNB lady earlier on the phone yesterday she was confused as her English accent is becoming very English and has to make an effort to speak with a English phill accent to a phill otherwise often they dont understand her
Sounds like your Mahal would settle in well as her English must be far better to start with
