From what I can see, she chose to be a surrogate. Her body, her choice
Where do we draw the line on that? Paid kidney donation? Or living cornea donations? We know that pregnancy and birth take a major toll on the mother, almost without exception. There's plenty of evidence that almost all surrogates are already mothers, with other children who are at risk if they lose a parent. Also more evidence that there is a toll on babies who are immediately taken from their birth mother (even if it's by wonderful and caring people). Unfortunately also plenty of examples of surrogacy gone wrong.
Paid surrogacy is often done with good intentions. But given all of the above - it's not as simple as saying 'her body her choice'.