I think the others have pretty much answered your question. But, as someone with autism in currently year 1at uni I went through all this last year, and I have 1 tip for you.
About open days, don't go to them. -let me explain why.
Open days, the Uni Is all set up different to how it is on any other day, they put up tables and big display boards, and of course their is LOTS of people Everywhere, everything is busy and noisy. The staff your wanting to talk to in details about this and ask lots of questions have many other students to see, they won't have all the information you might need because they will just have a selection of general leaflets of whatever they can get, and then you find the person there on the open day from support is not actually the disability person so knows nothing.
If you want any other advice please ask, I've been through it so happy to help.
A much better idea is to contact the disability or support service and ask to visit them on another day. Explain that your daughter has autism and so would struggle visiting on an open day, and that you want time to talk to someone in detail about it. you can also ask for the opportunity to see lecturers and accommodation at your visit too if you want that.
For the uni's I applied for I did this, 1 refused to do this, so I had to go on the open day (the above happened, it was a disaster). Another was wonderful, I visited many times over the summer, saw a few different lectures, went to halls-so much help with adjusting with going to uni-this started before I even applied. I guess it won't surprise you that I now go to the 2nd one. I never applied to the first, if they can't understand and make an adjustment of letting me visit on a quiet day I am not paying thousands of pounds to have terrible support and no understanding there.