...and use of PPE? If she has not had current and specific training, she has every right to refuse until it is provided.
That having been done, I admit that I'm not big on masks. I think a proper gown and gloves would be more helpful. I would also make sure that she's not out there for more than 2-4 hours at a time. We get tired and forgetful over longer periods.
Training, gown AND gloves, time limits in the bullseye...with those minimums she could be the safest person in the hospital.