Do you mean she's done a degree in Comp Sci? You say she was looking at IT but most IT jobs don't require a degree and few unis offer a degree in straight IT. Experience is often more important than qualifications in IT IMO.
Does she do a lot of programming, have projects on Git Hub, have her own website she's built on her interests, a youtube channel where she teaches people how to program or about something else related to her field that she's interested in, have a mobile app she's built, have a really good Linkedin page, have a number of relevant moocs she's done, have relevant voluntary work if not paid work?
Does she have examples of teamwork and leadership that she can talk about at interview? Does she declare that she's autistic and ask if they will give interview questions in advance? Anything gov related almost certainly will ie civil service.
You have to be really competitive and have a lot of really relevant stuff to have a chance these days. Her CV will need to stand out. What would have been fine 30 years ago might not be now.
I would put the money in a high interest account for now and really work with her at getting relevant experience. If she's anything like mine (ASD too) she may not have an out going enough personality at interview to land a job in hospitality or retail. I'd focus in on the comp sci side of things and help her make herself competitive there.
Also worth considering The King's Trust. Might help build her confidence up again, she might be able to use her IT skills and also gain team working and leadership skills which are almost always asked about at interview. I'd also say she needs to practise interview questions in advance with you even if she hates it.
I have one with ASD doing an apprenticeship in software engineering and I do think it can be a great area for autistic young people to work in. Tbh it was me pushing him to do a lot of CV relevant things, writing his CV practically for him, running through as many possible interview questions as possible and practising them that got him the role - he actually got the interview questions in advance - and now he loves it and is a really good programmer.
Has she asked her uni careers service if they could help in any way or have any suggestions?