I'm in a similar program at Southwest Skill Center, so I can't give direct answers about GCC or Maricopa Skill Center, but I can give some practical advice in general. If your daughter has any free time before the program starts, she'll have a head start if she takes a CNA course and also Bio 201 & 202 (Bio 201 & 202 are prereqs/corequs for the Maricopa Community College RN programs). I'd say about half the students in my class have the CNA course (which is not a requirement for MSC or my school, but is for GCC, so your daughter may already have the CNA course) or work as CNAs & about half have at least Bio 201 (and quite a few have 202 too - basically, because a lot of people are planning to bridge to the RN program too). I wouldn't delay going into the LPN program if she doesn't have those 3 courses, but they do give students a nice advantage. If your daughter doesn't have them, she'll have to work a little harder, but it's doable - just tell tell her not to get discouraged if it seems like some of her classmates are "learning quickly" - it's just because they've taken those courses already!
The school I'm at is good and the instructors are good but it does move fast, and I assume GCC and Maricopa Skills Center are similar. Hopefully her knowing that will allow her to plan her schedule accordingly. As long as she is willing to put in the study time, all should go very well for her!