She should probably take some of the supplements recommended for prevention. ..quercitin, zinc, nac, vit d3/K, etc...I’ve read it may help the vaxed too
I was reading that mulberry tea has some benefits to the lungs. I’ve been drying the mulberry leaves from the tree in my front yard and made some green tea from it. Not having the Covid nor colds since I’ve read about mulberry tea I can’t vouch for it one way or the other. Just FYI.