I think she will have great peace of mind having you there with your baby during the day. I'm sure I'll get flamed (yes, even in the Womens forum) but I had to go back to work 6 weeks after my daughter was born. I wasn't lucky enough to have my husband stay home. He was even busier than I was. I lined up great child care in our home, and frankly, it wasn't bad at all to go back. Yes, of course, a few tears, of course. Missed moments, of course. But I marveled at the ability to actually drink a cup of coffee when I wanted to, not when I could.
I completely understand why some would question my choices, but my parents were divorced when I was a teen, and like Scarlett O'Hara, I vowed that I'd never go hungry again, so not working wasn't even a going in option.
Pre and post work, I was a great mom. Really. Before I got her up for the day, I was fully dressed so I spent an hour or hour and a half with her before I went to work. After work, and before she went to bed, we were sympatico. Dinner, fun, bath. I so enjoyed being a mom, but being in the military, I couldn't take a leave of absence. I always told her that when she was eleven, this would be over. You know what she said the day after my retirement? Mommy, I wish you were still in the Air Force.
Transitions are always hard. I think I'd focus on managing the culture shock and just being really kind to yourselves. Sounds like you have some major changes in your lives so best wishes!