She is still young. For her, "home" means her parents and familiar things.
Try to have her new room as similar as possible as the old one (same furniture, organization, colors...) and keep everything "routine" related the same too (from her cereal bowl to the rubber duckies in the bath).
If her own world remains similar - especially the routines - the change of the "outside" (a different address, apartment size...) will not be as traumatic. And don't worry to much about it, at this age, they are still ver adaptable!
My son is 3 and already lived in 3 different places. He never had any problem to adapt. But, if I give him milk in the yellow cup instead of the blue one, if I make a mistake in the good-night song or the boat is missing from the bath, then we have a problem!
Good luck with the new place.