Hiring for childcare...important!!!?

I keep a 9 month old baby in my home. He gets excellent care. His parents rave about how good I am with him. I had a lady that wanted to come interview with me about keeping her 3 year old little girl. The child sweet though she was kept crawling up on furniture and the mom would not correct her. The little girl started playing with the ornaments on my Christmas tree. Her mom asked her," Can we please just look and not touch?'' Which the child obeyed. She is not bad. I noticed the mom babies her and is not firm when she needs to be. She told the little girl, " Go play in the chair next to the computer." I did not think it was a good idea. I was trying to talk to the lady. We were on my couch and the lady was closest to the little girl. The child crawled up on the chair which has rollers on it. she stood up in the chair and was leaning over the desk. I did not see this at first because my view was blocked by her mother sitting next to me. All of a sudden the lady jumped up and walked toward her daughter and told her she could not stand up in the chair. I think it startled the child. She suddenly flipped around and fell backwards and hit her head on the desk. It caused a knot on the back of her head and a small cut. Not enough for stitches. The woman was upset and of course i do not blame her. We babied the child and I doctored on her. The woman wanted to know if I thought she should be taken to the emergency room. I told her she always could to be safe but I thought she would be okay. i was a nurse. The woman said she was going to take her to one of those Kenmed places. She left and called me and said the one she went to was closed did I know of another. I told her of one I knew was open. Then she told me they were going home first to have lunch!!! I emailed the lady twice yesterday to see about her daughter. She will not answer me back. Of course I think I did not get the job. I do not allow children up on furniture like that, but the woman let her and the child fell. I had not been hired yet. Okay sorry that was long but I needed to explain the situation. Can this woman sue me?