Viruses can be contagious for ling periods of time. Can be airborne or contact (hand to hand, hand to mouth , etc.)
Don't have her babysit. You are asking for the flu if you do (in my opinion.)
I took care of a laboring mom and her newborne last year when I felt under the wheather and the was not a replacement RN for me to go home. I wore a mask and washed my hands so much they were peeling by the end of my shift, and wore gloves. By the end of the next day I had a fever and the next week my blood test came back pos for Influenza A. The week i got back to work (12 days after taking care of the mother and baby cuplet)
I was floated to peds. Guess who my patient was.... The 12 day old newborn I had helped deliver and take care of post partum.
Sorry, moral of story, don't risk it. CANCEL BABYSITTER. (also..... HOMEBIRTH!)
Michelle RN- Momma of Four Great Kidos