Perhaps part of the problem at Bristol is that others, like Bubbles' and Xenia's DC, are having such a brilliant time. It might then be difficult to admit that, perhaps for the first time, you are struggling. I dont think that necessarily implies fragility, though I can see why a student might, and therefore not want to admit problems.
In my view, support in advance of central support services, is also important. DD describes last term as the most difficult few months of her life. She got through thanks to the support of her facilitation group tutor and her senior resident. The latter being a PG stuident whose place in halls was subsidised in exchange for her looking out for the first year students around her. The tutor insisted on her going to welfare, mainly as a precautionary measure in case the issues affected her academic performance (standard advice) but in practice it was the SEN support people who helped steer her through some of the disjointed bureaucracy.
My understanding is as part of the welfare reforms, and to save money, Bristol will be doing away with their first tier support such as senior residents and local acccomodation offices. (The latter were also helpful, moved quickly and applied their knowledge of "noisy" and quiet flats to get DD move to somewhere suitable.) I think this is a huge pity.
I think DD will be fine. Overall it is probably an advantage not to be someone who makes their BFFs during freshers week, but to take time to build friendships. She likes her course and is doing well, has some nice friends, is engaged in wider University life and thinks the City is beautiful. However a friend yesterday suggested her son had become similarly isolated in his first year there, and though he did well academically, he never really jelled socially. Given so many are having the times of their lives, this becomes difficult. (In contrast DS was happy from the day he started LSE, but there academics were the focus so there was not the same pressure.)
Would DD choose Bristol again, Yes I think she would. In many ways it is the perfect place. However with the benefit of hindsight I think she would move flats more quickly (a student at Newcastle suggested you apply a six week rule. Students run out of money six weeks in and generally quieten down. If they don't you have trouble), and move again if the next flat was equally noisy. Moving is common, as it will be if you are asked to share with 10 strangers. (She almost certainly would not have had problems had she been in her current flat from the start.) She would also allowed herself respite from the newness, by coming home at some point during her first term. (Vets and some other courses don't have reading weeks.) And she would have recognised that though she came from a city, and indeed a private school, there would be a level of culture shock. (In her case it was the extent to which drug use was normalised. Of course there were drugs at her school, but not amongst her friendship group. Though this could be true of other Universities. Plus at Bristol students seem to have the money to go out several nights a week, perhaps not the case elsewhere.)