I'm not an expert, but were you home more for awhile and then went back to a normal routine? Dogs are sensitive and if she got used to you being home and then it changed again, she may have anxiety from that.
Has anything in her routine changed? If you have been sick, she may be sensing that as well.
Wrigley has separation anxiety, though it has gotten better over time. She used to chew the wall, baseboards, etc...
As for shoes, Crosley has a fetish with shoe inserts and I know she will never outgrow this. She's 8yrs old!
I'm sorry, I know I'm not offering help, just throwing out possibilities. I hope someone can give you some solid advice!
Good luck!