A friend of mine applied to a distinguished professor and he asked for 5 letters of support. So, she reached out to someone she did a significant internship with 9 years ago and he doesn't seem to be responding. He had been helping her out until a few years ago. I thought it was a bit rude after all the hard work she put into the work.
Is she doing something inappropriate?
She has other supervisors from the corporate world. Can she nominate them instead? Would it work?