Hi! Unlike you I am not holding on. I left the borg six years ago with no looking back. That being said, everyone is different, and what's right for one might not be right for another, and it seems to me that none of us have any room to judge the other. Keeping peace is a big deal and only you can know what to do. As far as your sister is concerned, she clearly cares and I'm sure she loves you very much, but on this subject maybe you could just ask for a little more space and time to make up your mind about how to go about everything.
I wish you peace and clarity of thought,
Mrs. Thor