Learn English – Why does Athe say “So needy” in this context

meaningphrases

I watched an episode of Big Bang Theory, here's a recap:

I don't quite get it when Penny told a joke and then Amy said "So needy." over the phone holding by Sheldon.

Well from ODO, needy means poor or emotionally insecure.

I'm not sure if I'm right: Amy thought Penny is needy because Lenerd left her?

But from the previous conversation it doesn't sound like so.

Amy is accusing Penny of being devastated about Leonard having a new girlfriend. Penny denies that she is.

Penny: Okay, I’m not upset about Leonard and Priya.

Amy: Your flaring nostrils indicate otherwise.

Then, as the conversation continues and Amy tries to console Sheldon about no longer being the nucleus of the group:

Amy: I’m not saying that you’re not fun. You’re the most fun person I know.

Penny interjects:

Penny: A lot of people think I’m fun to be around.

Amy takes this as Penny needing attention and validation that she is important even though Leonard is dating someone else.

Amy: Don’t be needy, bestie. That’s probably part of what chased Leonard away.

Then Amy and Sheldon continue to discuss how the group is now Leonard-centric:

If it were a town, it would be Leonardville. If it were an Islamic nation, Leonardstan...

Penny than adds:

Ooh, I got one. If you guys were a band, you’d be called Leonard and the Leonards.

Amy again takes this as Penny feeling devastated over Leonard having a new girlfriend.

Amy: So needy.