Unique nanny share situation with nanny's baby - pay question
First time parent here starting a new, unique nanny share situation and seeking advice on a unclear point. We found a wonderful, experienced nanny we connect with who has a daughter of her own the same age as our little one. We negotiated a rate based on her share rate since she's essentially acting as the other family in the share. While going over details, the subject came up of how payment would be handled if her daughter had to stay home for some reason. She said, in her experience, the family of the sick child wouldn't pay and the family of the other child would pay the nanny her single-child rate. This was a surprising convention to me, but it makes sense: the sick family is off the hook for paying and the nanny doesn't have her rate cut in half. The burden is shared between the two families.
How should we handle this case in our situation, where she is _both_ the nanny and the other family? She said she expected to be paid her single-child rate. This means if her daughter stays home, her rate would go up. This makes sense in her role as "family" to alleviate the burden when she'll have to figure out care for her daughter. But in her role as "nanny", it means she goes from watching two children to one, and her overall pay goes up.
I want to mention that we agreed on a sick time policy that should _actually_ be what governs most of the situations where her daughter gets sick -- they'll just stay home together. Thus I think the situation I'm describing will only come up rarely -- in unforeseen circumstances -- but it seems prudent to hash it out nonetheless. Also, since it should come up rarely, I don't want to nickel & dime her over a small portion of our agreement. Whatever we decide to do, though, I am curious on how others feel this should be approached.
Please share your thoughts! Thanks.