They went to uni hooding to leave their autism diagnosis behind so although true university knew, my child didn’t engage with DSA
Understandable for a teen ager to think this, but wherever we go, we take ourselves with us. A PP has mentioned that a 2nd university would want to know what steps have been taken to deal with the issues which your young person encountered.
It's a form of magical thinking to say (and I've had students say something like this to me): "If I can just have this extension, then I know everything will be OK." "Next time it'll be different" and so on ...
It's human to think like this but as we get older we start to see what we're doing!
So I hope the young person will take some actions. We can't help students unless they help themselves first.
As for starting at another university ... it really depends. In my discipline, we rarely take anyone into 2nd Year, if they haven't done our 1st year curriculum, because our degree has a particular approach & structure. Although the 1st year marks don't count towards a degree result, the learning does. And secondly, we rarely have spaces. We are oversubscribed more often than not.
So it may depend on a combination of degree discipline and institution.
What learning has your young person made or achieved? That might be an important conversation to have.
But please don't allow them to indulge in the catastrophe thinking of either "I cannot go back to the first university. It is all broken" AND "By going to this other university, everything will be OK"
It's to be hoped that your young person won't meet another set of flatmates who speak badly about them behind their back. But people are people - if it happens again (because young people living on top of each other can get on each other's nerves) how will your young person cope? What are their self-help strategies for dealing with people who don't like them? Do they have some ideas about developing a friendship group? It won't just happen - they'll need to go out & make friends, if that's what they want.