I'm amazed they let her have so many sections. Why couldn't she just have natural births (much safer)
Um, what? VB isn't 'much safer' than even one ELCS. Once you've had a certain number of sections, attempting VB becomes less and less safe. It was particularly not safe for baby number seven, given that she had placenta previa.
And as others have pointed out, it's not really about 'letting'. If a woman gets pregnant, the baby has to come out somehow, and if a section is the safest way which it clearly was after the first few, it would be unethical not to perform one. She's almost certainly had more sections than she's been advised is safe, but I'm not sure what you expected the doctors to do when she rocked up with number seven. VBA5C?!