In your experience have you seen this happen?

I am not a nurse but a Radiologic Technologist for 39 years. Medicine has been my life many modalities. My mother is in a nursing home unable to verbalize because of a CVA. She has ogelvies syndrome caused by over medication with narcotics in this same home. She gets frequent UTIs. I was in checking on her last week and when we put her on the toilet via hoyer lift. I noticed a contusion at the pubic area. Looked live it had been pinched (fingers). She also had a large tear on her arm, not uncommon because of her thin skin. Although I told the nurse on duty when I went to remind her that her clonidine patch was 6 days over due for change, she didn't even look at the area of injury. The next day when I went in it was BLACK BLUE and as big as a baseball. I inquired again as how it happened. Got many different stories, was also told that she vomited that morning when I had observed the contusion. I think it was because it hurt so bad when they damaged her. The final story that administration gave me was that it was done when they did the cath for UA. I have done many caths for VCUGs etc and never heard of that happening. The report that they had given the Dr. as I inquired was there was a bruse about the size of a thumb. I don't want to cause any trouble but there has been ssooo many problems. In a routine cath placement could this happen?