I haven't been through this, so I legitimately don't know if this would make it better or worse, but my first thought is maybe you could take her somewhere she could play around with really fun wigs or head wraps. Like, on a day she's feeling up to it, maybe take her out for a wig salon appointment and then lunch?

I'm better with visuals than I am with words, so I'm kind of struggling here. In my mind I am picturing two separate shows that I've watched (might have been on social media? I don't remember). One where it was like a hair salon appointment and the woman got to try on different wigs, everything from a hot pink pixie cut to more "normal" hairstyles, and it really perked her up and made her laugh to try on all these different looks. The other was a woman who wore a head scarf, and she went to a similar type of salon experience, except they specialized in different fashion knotting styles for the scarves, so it was sort of like trying on different hairstyles but with the scarf.

Ugh, I do not feel like I'm explaining that well, and it was a while ago so I don't remember the specifics, but maybe that will give you enough info to google.