When, if ever, is there a need to put a comma after he/she said and in front of "before..." or "with a smile"? For example:
"What a night," Shelia said, before disappearing into the crowd.
"That was delicious," Shelia said, with a smile.
Are either of those commas after said ever necessary? I see it done differently all of the time and can't get a clear understanding of why/when.