Jill was a regular of Bar Etiquette (her husband talks about how the staff are devastated because they all knew her)
It is very, very normal for a regular of a bar in brunswick to stay well past the 'official' closing time.
In fact on a Friday night, I'd be very surprised to see Bar Etiquette close on the dot. Maybe only if the bartenders were in a really bad mood.
So that part doesn't seem strange.
I usually don't make phonecalls in a bar though, it's too noisy, and it's a little impolite. I'd normally step just outside. I don't know if Jill did that, but it's what I do.
This is good news (that she is known to bar staff). Hopefully this means a sober staff member may be able to say whether she stayed on alone, made a phone call, spoke to someone unknown in the bar, when she left etc lease: