Yes, this is wrong. If I were in her shoes, I'd do your sandwich and then make you pay, thus eliminating the issue. If I were even more in her shoes, I'd remove gloves, handle cash with hands only, and then put on a fresh pair.
Then again. I used to work in a place where there were almost NO gloves, and washing your hands wasn't too common, though I tried to follow the rules because I know better. It's all gross, and I am not proud of the rules I broke there.
Here's why people should change gloves or at least have clean hands (for those who think this isn't a big deal): Once, my no-gloves boss made me a potential new product with potatoes that he mashed with hands that he licked food off of earlier. I ended up having diarrhea, though not so severe after several trips on the first day, for about five days.
I have a ServSafe Food Handler certificate that confirms your question to be right. I also now wear many gloves that I replace a lot during a single shift. It's worth it to change gloves!