She didn't say too much about it, except that she was leaving and was going to live with their friend Chloe. That's her on the left.
She didn't even tell her little sister Ramona why she was leaving, but Ramona is happy she can stay with the rest of the girls and doesn't have to move again.
I the meantime, the girls are chatting, as girl do, as why Rebecca left
As for now, it is a matter of now you see her:
and now you don't: