System preparing for a possible split?

I’ve had one split this year already. But my mom is about to have to have her back surgery done again and it’s major. I was 18 whenever she had her first one. I’m 21 now and have thankfully had a lot of therapy since. But last time was so horrific with the stuff from my family during it all I split. I feel like it shouldn’t be as traumatizing for me since it’s my mom going through the surgery. But it was so bad… The alter from then is kind of panicked over it, he’s not out as much anymore. But I started having an anxiety attack/emotional flashback a little bit ago I heard the main gatekeeper say something about preparing for a probable split. I don’t want to split again, but if it’s anything like last time I definitely will.

But I’ve not heard much about a system basically preparing for a split. This was a first for me definitely.