I agree with the others. Start in a small room that is comfortable and unlikely to give her any nasty surprises. The bathroom may not be the best room if she is likely to find showers, flushing toilets etc a bit scary but think about it in the context of your house. Gradually open up the amount of space she has access to depending on how she seems to be coping. Give her some dark hiding spots and keep the travel cage available for her to hide in if she wants to. Keep food/water/litter available all of the time so she can come out when she feels most comfortable. Make life as predictable as possible while she is adjusting. Make yourself available to her for pats but let her come to you on her terms. You can find a pheromone spray/plug in from the vet if you think you may need it called Feliway. It can help settle anxious cats.
You must be so excited to see her! Hope she settles well.