Barring any complications, this should be just be a small bump in the road.
My 4 pregnancies, childbirth and time after birth were quite easy. I took 6 weeks off with the first 2 and barely 2 weeks off with the last 2. I was not incapacitated at all, maybe sleep deprived, but not incapacitated.
For the first 2, I worked full time in banking and 6 weeks was standard maternity leave 20 and 23 years ago. For the second 2, I worked part time at church. Brought the babies with me when I had to go in and did much at home.
The Pms partner and baby's father will be the primary caregiver. Win/win. She' s taking 6 weeks off. With today's communication, off really won't be off. If she's smart enough to be PM, she can figure it out.