if it's true that they bullied her then why do you expect her to help them out?....
lbr IF the rumors are true then I don't see why you should be disappointed of her for not coming out to say: forgive them. It's ok if you forgive people who bully you, but don't expect others to do the same.
The thing is they don't NEED to know what happened, I'm pretty sure CMM won't come out and say what went down behind scenes. General public don't like t-ara, right now, they see them as bullies and bad people. SBS won't take chances and say: oh sure we believe you, even if everyone hates you we got your back.
That's not how things work.