How would you handle what happened at the work Christmas do?

[SneakyLilNameChange]

Have name changed as could be outing. Long term mnetter.
This Friday was our annual Christmas Party. Cut a long story short I made an error 6 months ago (sent an email to wrong person with info on another client) nothing horrendous but still an error. I apologised profusely at the time, to work and both clients and did the necessary training to ensure didn't happen again. From my POV it was over.
At the party a manager, not my line manager but another, came over and was going on and on about my error- the time its taken her to fix etc. I apologised again and felt terrible (she was v v v drunk). Kept coming over and repeating herself.
I left at 11ish and then my work mate told me she'd been telling her and another colleague all about it when I'd left.
AIBU to be really pissed off and take this further? I was in tears all weekend feeling terrible and like the whole company think I'm a joke. Would you have a quiet word with her or go the formal route or just ignore? I have been waiting at my desk to see if she came over to apologise (haha..) nothing so far.

YANBU- make a formal complaint
YABU- let it go or solve between you

A formal complaint. Use confidentiality as the main reason. I assume it was an event not on company premises, so that someone working there not part of the company (say bar staff) could have overheard.

On a company night out your drunken senior colleague repeatedly humiliated you and then proceeds to repeat your confidential information to other staff?

I think you are hugely under reacting.
Fxxk that. You made a mistake, it was dealt with.
Is it company policy to repeatedly humiliate staff?
I would be absolutely apoplectic.
Who the hell does she think she is?
I have heard of people being severely reprimanded for less.

You are entitled to dignity in the work place.
You are entitled to feel safe in your work place and on a night out.

Neither of which you feel now.
Find your anger.

She was very very drunk and probably feels mortified now, if she even remembers what she said. I can't see that anyone overhearing the 'conversation' would think badly of you. Even if they weren't aware of your mistake, literally everyone makes mistakes at times, and I bet most of us have sent the wrong email or information to the wrong person at least once, so it's not a shocking thing to reveal, though it should have been kept confidential. Try to let it go.

She should never have discussed a work error with you at a Xmas party or with others whatever your error was hers is far worse ,you were out of work time completely inappropriate of her

You're not a grass. It was incredibly unprofessional of her to discuss with other people and ultimately if she can't handle her drink and behave then she should not drink / limit her drinking.
She owes you a formal apology at the very least.