Your mold/web issue may be spidermites? I found a couple of pictures out surfing the web, and I am attaching them for your comparison. They actually show the nasty little buggers on the web. I don't know if you have a loupe or other magnifier, so you can get a closer look to make a determination of mite infestation.

As far as how to treat and whether you can salvage the mite infested, if indeed that is the cause, plants, there are probably some threads on this board which will give you some insight into the different sprays and/or oils and/or soaps you can use. That poor, hapless, little clone doesn't look like she'll make it though.

As a start though, I would remove the visibly infested/infected plants from the others and quarantine until you have a good plan of action for eliminating the unwanted pests/mold.

There you have my 2 cents. Hope it helps.