Yes, I noticed she wasn't wearing them the other day but I put it down to increased handwashing. Many women who have never bothered removing rings before hand washing are doing it now as if you don't completely rinse the soap off around you finger and dry it totally in can cause eczema and allergic dermatitis under the rings.
The combination of frequent handwashing and using hand sanitisers has also led to many women taking their ri vs off and using intensive hand care products overnight. I'm thinking she merely forgot to put them back on o e way or another