Seal, let her know that, while I will miss her and secretly hope that she comes back, I don't want to pressure her to come back if she doesn't want to (and I'm hoping none of the other RAFians do so, either). I totally understand what it's like when life gets in the way, so there's no hard feelings.
So just wish her the best of luck from me, okay? I'm sure she'll go on to do great things.