The idea of stubs is ridiculous unless everything is a simulation

Absolutely.
This was basically the brain child of one guy.

fiction will be fiction. and I'm tired of these lazy excuses: stubs, MULTIverse etc... they can make up whatever they want WY TOO EASILY so it just gets dull.
i stopped watching this since it is a TV SHOW:
- will never wrap up or end because all shows want to keep getting new seasons
- nothing has to resolve to keep going
no thanks to TV shows for me.

She will soon learn to adapt to Australian ways

I'm okay with it within this fictional setting, but in reality, yes it's utter nonsense. Even the Hugh Everett Level IV Multiverse theory that spawns fictional storylines like this one states that timeline branches can never interact with each other.

And I find Hugh Everett's Level IV Multiverse itself baseless and the product of fantasy.
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Never believe. Always question. Rebuke belief, a.k.a. bias, a.k.a. groupthink, a.k.a. ideology, the bane of skeptical, logical reason.