native(genetic) vs. environmental factors in complex reasoning has been a long and unfinished debate in psychology and other fields. Currently environmental factors seem to outweigh genetic.
First-The MCAT is NOT a tool for testing native intelligence. It is a marginal tool for peer comparison in medical school applicants and wont show how great a doctor one will be.
Second- a 26 and a 3.2 is fair enough for state and osteopathic schools (actually, I see you are from cali which has the most competitive state schools in the nation). Anyway, I am sure your daughter will let you know the reasons for her osteopathic route once she is comfortable with her decision.
As for wondering if your daughter forgot to express her native intelligence during undergrad...well only she can answer that question. I personally HATED undergrad (at least the academic portion) but still studied hard. I have a 3.3 and a 26 mcat and got plenty of interviews and the acceptance I wanted this year. I also wondered if I could hack med school also. But I currently work as an engineer for a fiber optic company. I have shot up the ladder here because I can simply translate formulas into working models, where the 20something phDers here can tell you how your cell phone works, but cant record a voice mail message(seriously). POINT your daughter will excel when she is in HER environment. You dont know what it is, she may wonder if it is medicine, but if you are supportive no matter how many times she changes her mind she will find it.