Hate to say it, but Faye pretty much brought all of it on herself. If anything, she should be pretty much happy Dora cares enough to not screw her over for health care. Most employers wouldn't give a damn.
I don't necessarily think Dora's the healthiest person mentally either, but this was about the best you could expect from someone put in this circumstance. As a business owner, you CAN'T have someone drinking at work. You just can't. Not least of the numerous laws I'm sure it breaks, or the ridiculous amount of disrespect for the job that takes... it was a pretty solidly shitty thing for Faye to do to Dora as a friend. You can't ignore that sort of thing, it doesn't go away, it just gets worse.. As shown by the fact that Dora's drinking over the course of the (week, I guess it is?)indeterminate time period has gotten rapidly and decidedly worse than usual.
Maybe it wasn't the best thing to do to Hannelore, either, dropping that kind of duty on someone who still, after all is said and done, has emotional/social issues of her own.
Either which way, Faye's pretty much been heading this way from day 1. The scenes with her family seem to have been nothing but a short reprieve from more of the same old, and it really seems like she's lost any and all of the progress she'd seemed to make. Add to that, given what she's just done, she really doesn't have much room to give Dora ANY crap over how she handles stuff.
All said and done, I've been in Marten's shoes on this one before, where my actions were the only thing between someone and a grave made by their own two hands. It's not a happy place. It's nice to know someone has a second chance because you did what was right, but the fact it was necessary is something that gnaws at me even today, ten plus years later. You can't sit by and watch that kind of thing. Maybe you can come back years later, as I did, and be happy for them if they've 'figured things out' for themselves, but sticking around all too often gets you looked at as the person who will save them from themselves. Nobody wants that full time job.
I hope if she ever does go back, Dora gives her the full treatment for doing this to everyone that cares about her.