Ah, a guarantee. If you find a guarantee for becoming "a Captain for a major airlines" please share.
1 Good for you for understanding the difference between what you were looking for and what the recruiters were offering.
There was a girl here in SLC this fall who was eminently qualified for an academy slot. Unfortunately she went on her own and let a recruiter sign her up before she got into the academy application process.
2 Not so good for not talking to/looking into the people/programs that matter. ROTC/OCS/service academies.
I have a USNA grad in PNS right now awaiting flight school. Another selected pilot a couple months ago, graduates USNA in May.
The U has both a pretty good AFROTC program and NROTC. We won't speak of that other ROTC unit there. She could go anywhere for a 4yr degree and commision through OCS to any service branch [don't forget the Coasties] after graduation.
JMO but I think the Guard is about the best option available out there of all. Get on with the unit based at SLC International as an E while attending college. They help with the school, she gets to know the people who do the pilot selections for the squadron over 4yrs. Assuming she does well, she graduates, they send her to OCS with an offer of a pilot slot. Every Guard unit loves their homegrowns. Is it all cotton candy and unicorn farts? Nope. Are there any guarantees? Nope. Are there commitments? Yup.
If serving her country [and free pilot training while you're getting paid] is not a thing, I offer this:
Pilot Pathway Program » SkyWest Airlines