Yes @hels71 I recommend looking at others, number one she could get rejected and also she'll need an insurance. I had one university I was set on (did apply to 5) but had to wait until April to hear back, and the rejection did break me for a while and I had higher than the entry requirements by a bit. I'm almost glad now looking back I wanted to do Law and went to York as the first uni I visited, I had loved it but when I went realised it was an absolute no (still a great uni just not for me). I then ended up changing courses over the summer, literally woke up one day and just thought why not? But going to York first I was scared that maybe I wouldn't find any uni I liked because I thought York could be my firm, but then I went to some other unis the weeks after, including one I hadn't thought of at all till a couple weeks before - Sheffield and actually loved it.
I know she loves it and has see it btw by point is that sometimes you can be surprised. I know I was many times, changing course, and different unis and going to one I had planned on rejecting but then after my rejection from the uni I was in love with ended up firming it and going. So encourage her to have an open mind, look at different unis and courses. I did go on UCAS and go through (used the location and course filter) and went through all of them and the modules - some I was very quickly like no, didn't like the modules or the focus. But it meant I didn't let prior judgements (that I'd gained by osmosis or other people's ideas) get too in the way, and it surprised me with unis I wouldn't have looked at without doing that and ended up applying to them.
Also, during open days you can go to many talks, so encourage her to prioritise the course lecture she wants but go to any she thinks maybe or I wonder what its like. It's how I changed courses quite a bit, and I'm so glad I did now.