I agree that AP does tend to give more credit when it comes to college time, but I'm an IB student myself and I must say, it's a very satisfying course to complete. (I can't comment on AP as I never did it.) IB is challenging, but from what I've seen, it prepares a junior for college like no other. My school is an international one and has been offering IB for the past thirty-odd years. This is my last year, in fact I've got IB finals going on for the next two weeks.
I think what you should ask about the IB program in your d's prospective school is whether or not the teachers who have been recruited to teach IB are certified IB teachers, and whether or not they are experienced with the IB Diploma Program. There are many tips and tricks to getting through the IBDP, and experienced, certified teachers will invariably be of more help than an AP teacher, for example, teaching IB material. Not that the AP teacher won't be a good instructor, because he/she will, but if the person doesn't have specific experience with the way IB wants things done then it could be a problem, especially because IB has a lot of internal assessments and coursework that should be done a certain way in order to get top marks, which I'm assuming is what your D wants
Also, ask about the course offerings! As a new or recently certified IB school, the high school in question may not be able to offer the more unusual or rare courses that your D might be interested in. For example, in my school, though 30 years have passed, we still dont have the option of IB HL/SL Psychology. Take note of what the school does offer, and compare this to your D's view of what she would like to study, that way you can be sure that she is headed in the direction she wants to be headed in, and not just in the direction that she was forced to take due to the school's limitations.
You might also want to ask if the program is 2-year or 4-year. I know that some schools have a 4-year course with 2 years of Pre-IB courses and then the 2 years of the regular Diploma Program, but my school doesnt have that. For my first two years of highschool I did the IGCSE curriculum which is British, and later entered the IB program, in the same highschool, for my final two years which I am now completing.
If you have any questions about the IB program, what it's like to be a student of it, what the course material is like, etc, just send me a message and ask whatever you would like to. I'll certainly respond! Good luck to you and your D as you look for options!