Wait a minute. A beer? No, that's not ok and I'd not leave my kids alone with her if she's going to drink AT ALL.
I hope you're documenting all of this. For no other reason than because if you're ever asked about her past behavior, she is obviously in NO position to speak about it so you need to be able to be detailed about it.
Her "celebrating" over being released from the hospital from a suicide attempt by having a beer? That just doesn't sit well with me AT ALL.
And about you being detached... how could you possibly be fully detached after all you've been through recently? Give yourself some credit. Your wife attempts suicide and where are you? RIGHT EFFING THERE!!! That says a lot about you. To YOU. To your KIDS. If she doesn't care, that's one thing but let it remind you that you know your priorities. You take care of yours. You protect what you can and you step up when you're needed. Keep it up.