Hi Patty,
I'm so sorry you're sick! Your daughter is old enough to understand your not coming due to illness. I would be honest with her. Additionally, I don't think she would want her twins exposed. Maybe you could tell her you're staying home because you don't want to infect the kids? Maybe schedule another special Christmas for when you're well?

You need to stay in and take care of yourself. Whatever you need to say to make that happen, then that's what I'd say.
Take good care.
((((((Patty)))))))

Love,
Okie