Well I hope Faye doesn't go back, even if Dora offered her job back, I really do. Both of their trust has been harmed, and as others have pointed out - Dora stopped hanging out with her in social occasions.
Also - if Dora offers, it will be on condition she'll go to rehab or stop drinking and go to meetings regularly or whatever. Dora likes to control people and her business like that; Faye would always be under the threat of being fired if she drank, at all.
This also isn't the job she should be doing - she's a good barista, but she could be a lot more. If she continues to be a barista, she should work anywhere else but the CoD.
Non-Disclosure: yeah. If Faye really has those folders of black-mail, probably. (And she wouldn't even need her folders, with all the health violations and unsafe work conditions in the CoD). Also, Dora has some weird secret coffee-roasting technique that she might want to keep for herself - remember the arc about her selling it to the Secret Bakery?