Hi Asitis. I think it may be best to approach this primarily with a child focus, and not make it about you and her.
If she has a cold, she is well enough to be able to look after the kids. However, if she has flu, she probably isn't well enough. I think if you use that as your guide, that may be a good plan. And if you are getting news that she is really incapacitated, you can step in and help to ensure the kids are well looked after.
Otherwise, you may want to wait until or unless she asks for help, in which case you can assist if you are comfortable and able to do so...
T 13 M 7 Me 48 H 46 SS 15 BD 7.14 PA D final 5.16 (H filed)
We receive & we lose, and must try to achieve gratitude & embrace with whole hearts whatever of life that remains after the losses - Dubus