< sigh > This is why the idea of a "market" in HE, and the "customers" (ie fairly immature young high school students) making rational decisions based on evidence is such a crock.
OTOH, whichever university she goes to, if she's clever enough, motivated enough, she'll do well in life. We get where we need to be, but maybe not by the route we expected clichés for free here
But what does she want to do after her undergraduate years? If she thinks she might want to go on to Masters or PhD study at some point (I knew at 14 that this was what I wanted to do so went to the best university in the country) then it would stand her in good stead to go to the university that is seen as the best in her field.
Also, is the university she now prefers for stupid non-academic treasons a big one with lots of facilities, a good student union, good cafés, bars, nice accommodation? If the originally preferred university has all these things, plus lots of student social/extra-curricular activities (eg excellent sports facilities, drama societies, good student newspaper, student radio, student TV station), then these are attractions she needs to have pointed out to her.
But I despair of young women who choose university because of the boys. One of my grandmothers was one of the first female graduates from Oxford and struggled to get there & get her degree. I should think she is revolving in her grave, if she could hear about choices young women make today, without realising the incredible opportunities they have.