I hate to suggest it, but could you possibly scoop her out and get some better photos. I have used a glass 4 cup pyrex measuring cup, held under the surface, while gently directing a fish into it using the dip net to kind of move it toward the glass cup.
It can be pretty stress free, the glass kinda disappears so they don't see it, usually.
The way you describe it sounds like finrot, or some kind of bacterial process going on. Finrot can have a bubble/blister-like lesion on the fin, but usually not tons of them all over the fins and on every fish in the tank.
Another thing, that they have the specks on their bodies as well as their fins definitely seems to be a parasite.
If the specks were more like little puffs of cotton instead of salt-like specks, one might lean towards bacterial infection, specifically Columnaris. Do you see any cottony type of lesions on the fish?
In the photo, that blurry fuzzy area on the fin looks a bit like Columnaris, but it's too blurry to see for sure.