I haven’t seen anything about the summer semester in UF. At least nothing explicitly said in MSF or regular bachelor’s plans of study.
I know that UF will give her a lot more credits for IB classes because it gives credits for standard level classes in addition to the high level ones.
IU will give credits for math and English HL classes (business HL won’t help with any pre-req/gen ed).
UF gives enough credits to knock off quite a few core ed requirements and basically have about a year worth of credits overall.