Before the dimensional travel, Tapiwa met with the girls who she gave a lengthy instruction about Margie and what they should do just in case she takes a long time to return.
She wasn't sure what would happen once she initiated the travel this time, so it was better to be safe than sorry.
In fact, her last instruction was, "Lock down the estate. No one should come in or leave before I return!"
With so much going on, Tapiwa didn't want to risk it, especially with Margie around.
Taking Margie with her would have worked as well, but this was a new world and if anything happened to the baby because she was being willful, Tapiwa would never forget herself.
She was better in the world she was raised in than a different one.
As a result, before taking Wynter, Tapiwa only packed what she needed, which was in the store dimension space. With what she had; it would be enough to last her for a while.