Just speaking for myself, I would not allow my child to take on the kind of exposure that you are discussing. The fact that we have underlying conditions does affect my perspective.

One thing that might be of interest if affordable is to tell her that she is being "laid off" (if you take that route) and so you will give her "severance pay" of (say) two weeks or one month of her usual pay. This will allow her time to find a more suitable job without suffering financially due to valid family health concerns.