Suing your employer for not allowing you to WFH during COVID-19

Background: My significant other (SO) works for a large publicly-traded healthcare company. My SO interfaces directly with nurses and other medical staff in-person. My SO is NOT a licensed medical professional and has taken no oaths to serve patients. The RNs (and other licensed medical professionals) my SO works with are in physical contact with patients who are sick and may be carrying COVID-19. There is absolutely NO reason they shouldn't be able to do their entire job from home as they work off of a laptop and use their personal cellphone to complete 100% of their job duties. My SO also has a myriad of current health problems (pre-mature birth caused life-long asthma, low blood-cell count, etc). Finally, my SO has requested WFH in writing from their boss (who is now out sick) and was told they were not allowed to WFH. My question: Can my SO make a reasonable case to file a lawsuit against their employer if they get sick? What happens if they're seriously ill due to the virus and their other health issues? I'm pushing my SO to call a lawyer ASAP. I also wanted to spread awareness to other blind users that this kind of treatment from employers is not acceptable (imo). I think this is a special case because my SO has pre-existing medical conditions that may be significant when combined with COVID-19 AND they work with medical professionals who are in physical contact with sick patients AND my SO is not a licensed medical professional. TC: 150k #covid-19 #coronavirus