Is there any way to save them?

I went out on a week long vacation, and when I came back I couldn't find my succulents anywhere on my windowsill. After nearly 2 months, I finally found them at my grandma's only to find them in this condition and retrieved them.

She swears she's taken great care of them and they look like this because of the cold, even though they were kept in her entrance which is complete enclosed and has no light coming in, and all their soils have been freshly watered.

I have a feeling this is because they've been overwatered not because of the cold.

Any way I can revive these guys?