Should I even bother applying?

this is the part of your post that I consider “too rosy” –

" I would not be at all surprised if you ended up getting one or more of these. I think you’d be a great candidate for the Robertson Scholarship."

WAY too rosy, imho, given the OPs less than stellar ACT scores.
I could be wrong[ I hope so] .
Yes, she has lots of EC’s, but those are NOT what gets a candidate moved to the front of the line when it comes to highly competitive merit scholarships.
She should apply to some of those scholarships, and then forget that she did .

Winning one SHOULD be a delightful [ and welcome] surprise, rather than something that anyone assumes is more likely to happen, than not.