She needs to get a reason and not let it go. There could be a medical reason that they didn't complete the operation. When my mother had her ovarian cancer surgery that also included a total hysterectomy, the doctor stated up front that she wasn't sure until she got in there to see everything clearly whether or not she would be able to remove anything.
That's strange: when I had my hysterectomy for cancer this summer, I was told that the surgeon might have to change the TYPE of surgery he would do based on conditions that weren't predictable, but that I was gettin' spayed that day for sure.
I can see saying that the doctor wouldn't know if she could remove everything via laproscopic techniques, or perform a vag-hys, but I can't imagine starting surgery and concluding that you couldn't remove the tumor after all.