Hi MCE, it is often said around here, to see if an addict is really in recovery tell them "no" and see what happens. Her reaction to your very foreseeable "no" says a lot.
And the sarcastic remark to your son about Christmas not being merry isn't appropriate.
Not to negate her sober time of course, but she's got a ways to go. It's a good idea to back off and let her work on herself.