For whatever it's worth, my dad flew off carriers in the Navy before getting out and joining on with a major airline.
When I was 16 and looking at colleges and careers, I knew what my major was going to be (aerospace engineering) but was convinced I wanted to fly for a living. I was applying to the service academies and looking at civilian options. Even after leaving for college I was looking at ANG and reserves for flying. Dad pulled me aside one day and said "look, the best thing I could tell you is that you don't want to fly for a living. I do, and I count down every day until I can retire. Get a good job, get an airplane of your own, and fly for yourself." He's also said that flying for a living all but killed his enjoyment and passion for it, until he finished his RV-6. The flying he does outside of work "is the most fun I've ever had, in any airplane", with solo flights during his Navy training a distant second.
If your daughter wants to fly commercial, is she prepared to spend at least half her nights on the road, sleeping in a hotel room (or worse, flying a redeye)? Is she prepared to have her landings loudly criticized by know-nothing passengers who can barely parallel park? Or better yet, is she prepared to take abuse from passengers for things completely out of her control? Is she prepared to miss holidays, birthdays, and anniversaries? Is she willing to be humiliated every working day by the TSA?
If she goes corporate/private, is she prepared for extremely demanding passengers with absurd requests and no-notice travel schedules? Is she prepared to fly to middle-of-nowhere airports with almost nowhere to sleep or eat, and be expected to be ready to leave at any time? Is she strong enough to deal with pressure (up to and including "I'll fire you") to fly illegally or in unsafe conditions?
A high school friend of mine was valedictorian and wound up going to the Air Force Academy. He wanted to fly F-15s in the worst way. But when he graduated and went through the early pilot screening/instruction he found out that he got violently sick from any kind of aerobatics or unusual attitudes. He was washed out of pilot training and is now flying UAVs somewhere. He's miserable.
LS, I'm not trying to discourage your daughter from flying professionally. But I wanted to share the experiences of friends and family that did so, and which influenced me in the direction of becoming an engineer and flying for myself instead.
I do know others who love their flying careers. The negative points that drove my dad and others up the wall just rolled off the backs of those who love it. Everyone handles things differently. The trick, I guess, would be making sure that you don't fall in the trap where doing what you love for a living kills your enjoyment of it.