Honestly, I didn't get on with anyone in my halls, I hated it, party animals, noisy, messy kitchen etc. What helped keep me sane was meeting like minded people on my course, who I could go for lunch or a coffee with, etc. I hated my first year in halls but stuck it out. It got much better when I moved to a shared house with course mates. I never kept in touch with anyone from my first year halls of residence. It was a miserable year though.
Slightly different, my sister didn't like her course, and switched after the first 4 weeks to a completely different uni and settled in.
I feel for your daughter, she sounds so much like me, except it was my stubborn determination and fear of letting my parents down that made me stay in my first year despite being miserable.
There's absolutely nothing wrong with deferring as long as you have plans for the year, eg a job or travel etc. Lots of employers value the experience anyway.
Ultimately it doesn't matter if she never goes to university, there are lots of other routes in to careers these days. I'm a senior manager in the finance industry, working alongside very respected peers of a similar age who never went to Uni, but found other options to get to the same position as me, and we're all seen as equals.