Is ghostbug always around, or does come and go?
I mean
Like
Is there like a radius she needs to be in?
Can she go visit her family and watch herself?
I feel like that would be really painful.
Watching your life from the outside, knowing that something essential that made you you is just gone.
Knowing that what you are is the end for this version of you.
And knowing that the other you lives without ever knowing how it is to be loved.
All the experiences, all of the moments of vulnerability and discovery, the life you've given everything to - all of that effort just evaporated.
No more confidence. No more resolve. No more work ethic.
It's your beta version.
And with her, the world doesn't need you anymore.
Ghostbug generally stays close to Adrien. She gets really worried about him if he's out of her sight. She hasn't really experimented much with a potential radius since she doesn't want to get separated.
She does go to her own room (or at least her other self's room) eventually, but only as a last resort..
Ghostbug kind of dissociates from the "other Marinette". It's a little weird seeing another you that acts like you, but then also doesn't act like you. There's a lot of feelings to unpack there, but Ghostbug is doing what she does best by ignoring one set of feelings for a different set of feelings - that being her concern for Adrien.
She can't think too hard about how she and this Marinette are essentially the same person when all her focus is on fixing whatever issue has caused this and smoothing over all the hurt, stress and anxiety this Adrien has gone through.
Being so focused on one aspect of the big picture isn't always the best method though...
And remember we haven't seen a lot of alternate Marinette yet, and its mostly been through Adrien's POV. And Adrien's memory and version of things clearly isn't the most reliable.
No confidence? No resolve? No work ethic? How can you be so sure? This is still Marinette. She's different, but she's still the same person underneath. Perhaps her strength just comes across in quieter ways, or perhaps she hasn't had her chance to be loud about what she can really do.
This is still the same Marinette that *could* have been Ladybug. Why she isn't in this timeline? Well, that's part of the mystery.