Advice?

So my husband and I have been TTC for a year now, but nothing so far. My mother in law works in the special Ed dept in the local high school and one of her co workers has a 6m/o baby girl. So I was offered a job to watch her while her mom is at work. I love it! It's so fun and rewarding but I can't handle the mother! She is such a germophobe to the point where I literally hold her all day every day. She isn't allowed to touch the floor or anything I haven't already cleaned with Lysol and that's just the beginning. I had a really important meeting one day and she was so angry with me. Even though I told her a week before. She sent her 14y/o daughter home and lectured me for like an hour about how she's never been alone with the baby. I knew how to watch a newborn when I was 10. So I could understand if this was her first child but it's her third. I respect her wishes and I do everything she asks. She gives me a set time to be to her house every morning(where there is seriously the grossest messes. I've even found toenails on the floor), and will text me one minute before I'm supposed to be there, when I'm parking my car, to not come until another time. This morning I got here and she was already gone. Her husband was getting the other kid ready for school, and she said to call her when the baby wakes up. So I did. That's when I learned that she has thrash. A yeast infection. That is contagious. Both baby and mom have it. My immune system should be fine and I am washing my hands and sanitizing like every 10 minutes but I have severe anxiety and I'm about to lose my shit on this woman. Who does that?! She should have told me before I got here and was here alone with this baby that I can't put down!