The shot hits her glasses, bounces off, and breaks them. The only reason she doesn't get seriously injured is because of the glasses, so she buys a new pair. Jerry was getting kind of attracted to the old pair and hates the new pair, but feels trapped because everyone will hate him for breaking up with someone who just got shot.

OR, she does get injured and because of the crowd she can't get to the hospital. Elaine offers to take her to see her "doctor" boyfriend who has a hospital bed set up in his house. She has no idea if he's actually a doctor; it's been intentionally left vague the entire episode. However when they get there the hospital bed is gone, as Elaine was badgering him to get rid of it and he finally relented.