My boy slept in his own room since birth. But judging from what my friends do, the transition depends highly on your child.
I think shifting her to her own room when the new house come will be easier than if it's in your current home. You can start preparing her now by telling her she is a big girl. It could also help by decorating her new room with things she like and asking her to be part of the decorating process. If you intend for her to sleep on a mattress, then you have to start training her to sleep on a mattress now. If nights are out to train, you can train during her naps.
My friend got his daughter to build her bed together, deco her room together. So the transition was pretty smooth. If there is a bed time routine, like reading a booking or singing or praying, you could do those so that she can recognise those to bedtime.