Please do not spend your time cleaning your bathroom for your cleaning person. Really - that is very silly :) She is not a guest and she's not going to judge you if you have a dirty toilet. She's going to clean it anyway, so it's a waste of your time to clean it before she cleans it.
There is a big difference between picking up clutter and cleaning. It is good effort spent to pick up clutter. She will clean your kitchen counters and sink - but she can't do that if they have dishes on them. She will clean end tables, etc, but she can't put away your mail because she doesn't know what you want to keep or where to put it. She will clean the floor, but the toys need to be picked up for her to get to the floor.
So, by all means, pick up clutter. But please please do NOT waste your precious energy cleaning the bathroom, kitchen, or anywhere else.
ETA: You don't have to leave the house - she can work around you. But it is a glorious thing to leave a dirty house and come home a few hours later to a sparkling one. So, getting out is a good idea for YOU, if you can do it.