Russel group unis aren’t everything. Students get fed a great deal of rubbish about ‘best’ universities. Relevant for some subjects, not all though.
The school/ college should have a careers service, your daughter ( and you) should be able to see an advisor to help navigate the process.
Is the school having a parents event for this? Many do. If not, there is some great info on UCAS aimed at parents.
To start though, your daughter can create a UCAS Hub - this will create little files where she can save her favourite courses. ( once an account is created, you can ‘favourite’ by clicking the little heart on the top right of the course page). It will also start to send info on open days too. You can create a hub too if you like- then delete it after. That way you can get to grips with the system.
I would absolutely do what a pp suggested, and go to your nearest uni open day, just to get a feel for how open days work.
Usually students know how far away they want to be from home- start there. The UCAS filter doesn’t work very well for distance.
Does your school have access to unifrog? The search tool is pretty good for that.
On the uni course page you will see modules/structure/course content. That will tell what the course is comprised of.
If she likes graphics, she may also be interested in Computing for creative digital/ Game development degrees. If you put ‘creative computing’ in the ucas search box, courses will come up.
It doesn’t matter if she has autism ( for employment). I know someone who just started a graduate role in a computing related role, and the vast majority of the team ( large team, big company) had some form of autism