Kaitlin hired me at 37 weeks. This isn't the most common occurrence, but it happens from time to time. Whenever it does, I am OVERJOYED! Doulas want clients to do whatever they need to have support in their labor. If that means deciding last minute that you want support, then do it!
In Kaitlin's case, labor was on and off for a couple days. Yes, the books often have a model for what labor looks like, but our bodies tend to not abide by anything in a book! The drive to the birthing center was about an hour, so once they checked in with the midwives, they made the decision to head next door to the "hotel motel holiday inn". Things progressed very quickly after that...