Basically what people are thinking happened is that when they renegotiated her contract to include the pilot out, there was something in there saying that she had to go back if she didn't find something. And then CBS/ABC blackballed her from auditioning / putting in for any of their new pilots, so she could only really do NBC, so they basically set her up to fail.

And I understand her perfectly: She's glad to be back with her friends, but she doesn't like the fact that she didn't have a choice one way or the other without having to take legal action to break her contract, which is expensive and probably more of a hassle than it would be worth. She's been very clear about the fact that it's the network and the bullshit they've pulled that she's not happy with--she's not upset with the fans or cast or crew.