I don't like Pelosi. That said, she looks like she either had a stroke or too much botox. Take your pick.
So I'm not convinced it was a smile, but who gives an airborne copulation? Someone may have caught her eye by nodding or something and she returned the gesture. I don't know, but I can say out of about 10,000 things to get pissed about, this should be about 9999.