I agree with OP that everyone should cut her some slack. This is her first time going through this. Now she knows better and will do better.
FYI, I am still in contact with ds2’s HS gf. No big deal (they are 25 now). She came back home after college (he didn’t), and we share a lot of the same interests and genuinely like each other and occasionally see each other at events. The other day we were on a Zoom call with about 100 people, and she private msg’d me a Hi! It was funny. We were at the Michelle Obama Becoming book tour last year, and she found out where I was sitting and came over to talk.
It doesn’t have to be awkward, but there does need to be a “cooling off” period or you risk alienating your dd. My mother helped my HS bf try to get back in my good graces soon after I broke up with him and, well, let’s just say it didn’t go well.