Common Data Set GPA vs. how the college computes GPA

My daughter attended 9-10 grades at a 0-100 grading schook, then 11-12 at an IB school 0-7 grades. I have no idea what her 4.0GPA was…tried asking some colleges (e.g., UMass) but never got an answer back. Only time it mattered was for State Flagship auto scholarships, but a quick email took care of that.