One thing to note is that Mendoza is less than 1/5 the size of Kelley. Not sure about class size but - just like IU is much bigger overall, the IU program is much larger. Not sure if that matters to your student - whether they want a larger or smaller school (but not small).
And getting into a specific college is no assurance of a specific career. Just like not going to a specific college doesn’t mean that the door is entirely shut.
Over four years, sans scholarship at either school, the delta is well over $200k - which you may or may not be able to or desire to afford.
Best of luck.