Hello stranger, good to hear your DD is still on track and enjoying her learning ;)
Is there a reason she didn't have Durham on her shortlist? Otherwise, I think you have captured all, the key ones in UK will be, aside from Oxbridge St Andrews, Edinburgh, Durham, M'cr, Leeds, Exeter, SOAS and I think KCL. Some will be more lit heavy than others.
You know where mine is, but Arabic doesn't start there until Y2. She is loving the course, it's very multi disciplinary, JH with Spanish, and is much more contemporary than the lit heavy courses in UK.
She walked away from McGill in the end because the year abroad wasn't guaranteed and much more challenging to secure vs here, whilst geographically being further away for language immersion. The ability to travel to her language speaking countries was important as decision time came, and this year alone, she has 'hopped' across to Europe 4 x times since Oct.
I believe, through one of her friends being a fresher this year in Edinburgh, that there are circa 6 students studying arabic (JH with another subject) and whilst she has egyptian arabic, she is finding it tough and not enjoyable. It may be just Y1 jitters though and not gelling yet with course. Mine is in a class of 20, only 2 from arabic speaking households.
For us, which is different for your DD, given she has already self taught to a good level, was that the ab initio for arabic was as level playing as it could be, but accelerated learning from Y2 still resulted in same language proficiency as a top tier UK course after 4 yrs. We don't know the answer to this yet, but she currently gets decent contact hours with interesting modules spread across medieval and modern european and ME geographies. But there is a lot of Islam as well as Jewish studies in the mix.
There may be a higher mix of native speakers/heritage with the northern UK unis based on their geography alone, but each cohort intake is different.
Good luck to her, wherever she selects, and PM me if you need more info on mine.