Yes, thats what she is concerned with.
She has thought about an Aupair. Next question is how to work out the logistics if she takes an aupair with her on tour. Where does the aupair an baby go when she has clients? 
She would have to book 2 rooms. At this time of year it wouldn't be fair to say "Just make yourself scarce for the next 8 hours" and expect her to just take the baby out all day.
Here's an idea:
Book a family/twin room at a cheap hotel for her, the au pair and the baby to sleep at for the week. Hotel doesn't need to be workable.
Then book day rooms at workable hotels in the same city so she can work approx 9am-5pm, then go "home" to the baby.
That would probably work out cheaper than booking 2 rooms.