IU Kelley has a considerable advantage over the other schools you mention in my experience when it comes to IB. Kelley has become a target for many large CIBs.
If IB is her chosen profession the incremental access can easily justify the incremental cost when amortized over an IB career.
Keep in mind a solid newly minted IB VP (5-7 years post undergrad) will draw a base salary of approximately $250k and earn a bonus (performance dependent) of 100 to 150% of that base. The amounts you are talking about are hardly relevant juxtaposed against that earning potential.
Getting there however is hardly guaranteed so it is of course a very personal assessment.