T.S.
Chrissy,
As parents who had to do the Heimlich TWICE on our son at about 18 months and again when he was about 2 (due to him over-stuffing his mouth), we are a bit cautious - maybe over cautious about choking.
I'd just tell her that you have a friend who this past weekend had to do the Heimlich on her 2 1/2 year old because he was eating a grape/hotdog/piece of banana and started to laugh and it got stuck in his throat.
This is a little white lie, I know and usually I don't believe in lying, but it would make the conversation easier, I think.
Good luck.
T.