It sounds like she's quite dependent on this friend, so it might be hard to persuade her to look at universities independently. Has she told you why she wants to go to the same university as her friend? Is this friend being pushy?
The likelihood is that if they went to the same uni, the friend she relies on would make new friends, drift away from her, and your friend would end up lonely and full of regret. There's also no guarantee that they would be given accommodation in the same flat/building, not to mention their timetables and locations of lectures may be completely different.
If she wants the best start to her adult life, she needs to consider which university is best for her and her alone, not thinking about what others may want.