As I said upthread, they handled it badly and unkindly.
But, there have been several comments suggesting that the other students are prejudiced, even ‘bigots’, by not making accommodations or allowances for the DD’s autism.
If they were prejudiced then they wouldn’t have wanted to live with her in the first place. Whereas they have tried living with her and, for an unknown reason, it hasn’t been successful.
A friendship group or relationship isn’t a workplace or public service and there is no equalities obligation to accommodate someone’s needs, regardless of their protected characteristics. Allowing for someone’s needs in a friendship or relationship will only ever be done out of love and compassion, which no one is obliged to provide. They are free to withdraw from the friendship if they wish.
It’s horrible for the DD but I think it might actually be helpful for her to know the reasons and reflect on what she brought and contributed to the shared living situation. Because it has to be a two-way street, regardless of individual needs.
The parent above who is teaching their DC to be a good housemate probably has the right idea.
The ever-earlier pressure to sign up for accommodation really doesn’t help. Signing for the following year in December is crazy, as a lot can happen in the intervening months.