I'd tend to agree with your feedback @donstrenchcoatanddarkglasses , amongst DD's offers from UK unis that included M'cr and Leeds, she thought she'd be starting ab initio Arabic with more native speakers which whilst not insurmountable, would make it a touch harder. She's found drop out rates of the language (anecdotally) from her peers from the likes of Edinburgh, St Andrews and Leeds to be high vs those taking other languages. I don't know the demographics either but assume it's small, given its low accessibility in the MFL pool in UK, but then most language faculties are challenged right now, marginalised languages often demoted to the 'elective/language suite' learning.
Unlike your DD OP who's already undertaken a MOOC and engaged in the literature so knows she's happy with both, work backwards, does she know what she may want to do? What type of year abroad does she want to experience? Does she intend to use her languages or just leverage the skills as part of her wider UG studies for her next stage. All uni offerings will vary, some will be more hands on than others, who will leave the choice to the student, including the destinations available for both geographies which have their own set of challenges right now, so flexibility is key.
Mine is about to start her Y3 abroad from Aug 24 in Cairo (fingers crossed, already undergone one location change) and Grenada, benefitting from Erasmus+ access for 2nd semester due to where she is studying in EU. But her mandatory study requirements are at unis (vs intensive language school), gaining 45 - 60 ECTs where many of the modules will be taught in local language. She will then drop Spanish in Y4 on return, focusing on Arabic only to attempt to get it to same level, as she wants to use both if possible in her career.
The only Russian takers we know in her age group are at UCL, and both students have had access (studying Russian and Ukrainian) to year abroad but, with more flexibility, British Council, community work etc living with families vs campus uni life. Both have gained fluent, excellent levels of Russian.
Good luck to your DD OP, both very challenging but exciting territories to become expert in, mine had really enjoyed the immersion into all matters ME on top of the hispanic programme.