Depends, I think, on her and what she can bring to it, and to her patients.
It could be a fulfilling and rewarding area to work in, for some people.
I was never directly involved with the area, just helped with some female exams and monitored a few critical pts who needed urgent treatments. I worked mainly in Interventional Radiology, Angio, CT, etc.
Can potentially be a depressing area, yes, but think what the pts are going through.
Might be a good idea for her to interview and shadow a Rad. Therapist or two, in her area?
She might want to also check out a Radiologic Technology program.
Could go thru that, might like the general duties, or might like to branch out into Ultrasound, MRI, CT, Nuc Med . . .
Good luck to her, whatever she chooses!