Tell your wife to take a few sick days while it all blows over.
I am very fortunate. The company I work for and the boss I have both prefer that when a person is sick, they stay home and not bring it to work. The company is self-insured for short-term disability and pays us 100% for the full STD 6 month period, thus, those are our sick days. Yes, I get 180 days a year. Of course, you DON'T want to be caught abusing it!
We also have a pandemic plan in place where, should out first case of swine from an employee known to have been in the building with it, and that person is verified by the hospital and CDC as a swine flu victim, immediately, half of every department will be working from home for the next 5 business days. After those 5 days, everyone swaps and the next half goes home for 5 days while the others come to work. We have at least two people in every department that can perform the work of a coworker plus their own job should it be necessary. But, we also have an excellent VPN system in place and people have connectivity from either a work laptop OR a home PC with our client software installed. The person who had the H1N1 cannot return until they have a Doctor's note that says they have recovered.
It's obvious that we are the rare exception and far from the rule, but I just wish the majority of companies could do the same.
She needs to take all the precautions she can. Mask, washing often, Purell at the desk, extra vitamins B complex, C and Zinc in the morning and every night. And if she feels this is not enough, stay home herself until it is safe to return.