What are the laws regarding nursing aid in an assisted living facility?

I helped my sister move into a very nice assisted living facility one month ago. She is very happy there, and, everyone seems very helpful. Yesterday, I took her to her podiatrist, who noticed a small break in the skin under her second toe. The doctor wrote an order for an application of Betadine to the break, to be covered with a band aid. I purchased the betadine and band aids, and, brought them to the nurses' office. I was told that they are not allowed to do this. They contacted the skilled nurses to come to the facility, they said it is not a skilled nursing treatment. It is evidently up to the family to perform this. I live 20+ miles away, and cannot go there twice a day to put a band aid on her toe! How is it that the nurses can check her blood levels, give her an insulin shot, put a band aid on her finger, but not her toe? She is obese, has arthritis in her back, and knees; has had her second hip replacement in March, and cannot reach her feet! Has anyone run into a similar situation? It seems ridiculous.