Friend posted a harsh message in group chat after my apology

[70Cats]

Group of friends (6) for 10 years. One is ultra sensitive borderline professional victim. I thought I’d upset her recently so before the others arrived I apologised. She replied very angrily, so I explained that I was shocked at the incident and apologised again. She was very aggressive so I explained that she also upset people. She stopped when the others arrived.

We sat for two hours chatting and laughing.

When I got home there was the most awful post on our group chat saying how I ‘launched a passive aggressive attack under the guise of an apology and could not put up with such unkindness so would leave our group but would welcome seeing people for coffee’.
Shocked, ripped to pieces, sick I was devastated. On a group chat for my friends to read. How could someone do that.
I feel so strongly about this I am thinking of seeing a solicitor to sue her.
Please talk me down.
.

She replied very angrily, so I explained that I was shocked at the incident and apologised again. She was very aggressive so I explained that she also upset people.
"Explained" is an odd word to use there. And why were you shocked about the incident if the incident was you doing something upsetting? Did you shock yourself? I agree that your apology was passive aggressive if you attacked her character off the back of it. If you didn't describe her so negatively I'd think you'd reversed the roles. Presumably there's a big back story we don't know about to make you both react so strongly, but yes, you need to think twice before attempting to sue anyone over mutual sniping. You could gain a very unflattering reputation.

Sue her ;)