who can blame you for not wanting to babysit these kids anymore... She must feel bad, that the daddy can't watch the kids.
I have however sent my kids to a babysitter (she took only my kids) with "pink eye" When they only had meds in them for 18hrs, not the 24 recommended. I have never caught pink eye from my kids, it is very contagious and we used to get in our house like clock work every two weeks. (Thank-you swimming lesson's) I also sent their own face clothes ect. to babysitter, so she could use it, throw in bag, wash hands and be done with it) She never caught it either. with my babysitter, we had to pay for last min. cancelations, even when my van broke down ect. She resevered the spot for my children, why should she lose out cause my kids are sick, or grandma wants them for the day ect.
i would make her pay for days, you have set aside for her, even if the don't come period.
If they throw up, have diarreha ect. they need to be sent home. Daddy can watch them.
As for sending them all the time when daddy is home, while we go through that every winter here, with the babysitter when their too young for the daycare, now with daycare, since their old enough. If I pulled my kids form sitters/daycare, we will lose our spot. Daddy stays home, kids get dropped of as per usual. We pay for the spot either way, i'm not suppdised. I pay full cost. Why keep the kids home when your are paying for a full spot.. I do keep them home when sick, of course.. Then they have a special day with daddy on couch @ home.
I would say to her, where do you like to be when your sick with the flu? At work, at a friends our at home, on your own tollet... How can you do this to the kids, leave them in their pj @ home with dad. Maybe daddy doesn't want to watch the kids, it's time for her to toughen up!! She could maybe even use you as an excuse. Daddy, you must watch the kids.
Good luck, you don't deserve this. you can buy poliysporn over the counter for pink eye. (here in Canada anyways) Go get it now, go ahead to your families tomorow... Wash your hands, don't rub your eyes. It goes around so bad in daycares cause children have poor hygine, you are an adult, you should be able to control the hygenie factor...

Edited cause my grammer sucks, sorry