I have really said all I need to. I agree with Katherina.
However, and as I have being doing over the past 4 years, have to disagree with Bubbles over
" London is very expensive unless you live miles away from the university in the suburbs and menu stufents have to do this. I assume you have looked at halls of residence for year 1 though. Therefore the student experience can be diluted in y2 onwards if the student is not living in an area that isn’t what they imagined London to be. "
DS left LSE (about 20 minutes walk from SOAS) after 4 years ago, and had a great time. Whilst I can see why your perspective might be skewed if your friendship group is rich Saudi students, that was not our experience at all. DS spent his first year in an intercollegiate hall and the next two sharing an ex-council flat in a quiet and safe block with three others nearby at similar cost. His friends were a mix of British and frugal international students. There were Auistralians on his course at both UG and Masters level.
Because students can be scattered, a lot more seems to happen on campus, whereas DDs experience in a more traditional University is that very little happens on campus and whilst the richer ones hang out in coffee shops and clubs or at each other's 21 birthday "bashes", the others visit each other in their grotty flats or go to 'Spoons with vouchers pilfered from freshers week.
Picking up casual work, say waitressing at events, is not hard.
London has great transport and walking, Boris Bike and bus dont cost much. There is masses to do that is free. Lots of Universities close to each other, so absolutely normal to go, say, to the popular LSE disco on a Friday night then see a band or something at UCL on Saturday. Bloomsbury is quiet, and the cheaper restaurants/bubbletea shops in Chinatown, just to the south, are packed with students. DS and friends also often cooked in groups. Student London exists in its own Universe, and to some extent is oblivious to the London adults know.
So do the sums on fees, student accomodation and flights. Then note SOAS is probably three years and St Andrews/Edinburgh four. If the figures add up and she wants to go to London, I think she should. Partly because I think everyone should live in London at some stage in their lives, but also because she would get huge international exposure, and if she then works in the development field, would have great contacts wherever she went.