First and foremost, shame on you for filming your nanny w/out her knowledge. This is just deceptive and immoral and if she finds out, you just may be stuck w/out any childcare help.
She may be preggers, hung over or bulimic. Or she could also have a type of sickness that can be spread to your children.
I would come clean and tell her I am aware of her vomiting. Let her know you are concerned about her health but also would like to know if it is something that she can pass on to your child.
Open communications is vital to a successful Nanny/Parent relationship. You owe it to your kids to confront her.
Hope this helps.
Good Luck.
