She explained the story while on Jimmy Kimmel Live:
I was reading an article, and he said this really sad thing about how all his dreams were coming true but he didn’t feel that he had a bed of his own, he was always traveling. I remember being really busy also and thinking, that’s so sad, to have all your dreams come true but not have a solid foundation. So for some reason, I though an aerobed would help that for him. In my head, I thought, He can travel with it, then it’s always his safe place. I didn’t go over it with anyone, I should’ve been like, “Hey, should I send this to Matt Damon?” and they would’ve been like, “No, you’re crazy, don’t do it!” But I didn’t, so I got the information he was in Paris, filming something, so I sent it to Paris.
Kimmel joked in response, “You know why you didn’t get a thank you? He’s creep! I mean he’s got no class, what kind of person doesn’t thank another person for sending them a bed.”
I’m guessing that Jennifer will be receiving a note very shortly from Matt Damon.