That's Lisa' wishful thinking. There is absolutely no reason to believe this young lady is not qualified to be accepted by Harvard. You'd think the other 14 offers would give Lisa a hint but well...
I admittedly do not work in admissions nor have I ever, however what I do know of schools and companies in general is that they love it when they can showcase one of their students or employees in the media. It makes them look good.
I would suspect that Harvard, as well as all of the other schools who extended her an offer probably looked at things such as she's been on the debate team since 8th grade and has excelled in that arena.
I looked up her name in some of the local news agencies in Miami and two of them mentioned her high grades but this article I think expands even more on her life and how she arrived at this moment. It's more than deserved from what I can see.
This article also has turned on a light in my brain regarding those people who have faced adversity in their lives versus people who have not. It doesn't make us "better" people but it can cause us to be more compassionate towards others and have more understanding of where other's life journey may have taken them.
I saw a quotation not long ago that states "Do not judge, we're each on our own journey"
https://www.miamiherald.com/news/local/education/article261982815.html