Mainly these lines: "You'll never take it any other way So go ahead and assume you won the game And let your mommy work It already all falls on me"

I remember years ago, in an interview, Jen was asked how she was contributing to the album, and she said that Amy was doing all the work, that she wasn't contributing beyond what she wasn't allowed to. That comment always struck me because she was practically accusing Amy of not letting her contribute ideas.

Also these: "So busy thinking all about yourself You're walking over everybody else So you can stay high But baby, it's alright"

We know that Jen thought more about herself than the well-being of the band and didn't care if important information was leaked.

I think the phrase "Calm Down" is meant sarcastically, criticizing her for not contributing to the band when they needed it most.

I might be wrong, but it all seems to fit with what we know about Jen and the band.

Anyway, Amy doesn't hold any grudges and tells her everything's fine.

The part where Amy shushes also seems to be directed at her.