Read somewhere that she's also considering it. I'm sure the offer is there. But it could/would tank her completely. But you never know, she was better than Trump in their debate in some ways.
She was better in terms of being scripted, sticking to the point, and baiting him. She was awful on substance.
But he lost it more than she won it. He took the bait, and missed softballs.
But it also cannot be downplayed that Trump was in a different environment, with the moderators also debating him, fact checking (incorrectly at times) and leaving Kamala's lies unchecked.
However, she'll not be able to do something like this without giving the right at least five soundbites to grill her on. She's too much of a politician and less of a real person. This is why Trump can shine in these situations.