Amanda--has she looked at some parenting resources at the library or barnes and noble...they have books about everything.
There is a magazine called Working Mother magazine. I've seen it at the doctors office--a subscription would be a good, ongoing reminder that her choice to go back to work is a normal one and nothing to be feeling bad or guilty about.
http://www.workingmother.com/ (having trouble with links on the page...so I can't look around and find anything).
Researching--you might peruse more carefully to make sure I didn't recommend an inappropriate book as I'm reading the summaries and assuming they are Pro-working mom, so if something sneaks through that isn't, I apologize.
The Working Mother's Guide To Life: Strategies, Secrets, And Solutions
Linda Mason
Author Biography: LINDA MASON, cited by Working Mother magazine asone of its "25 Most Influential Working Mothers in America," is chairman and cofounder of Bright Horizons Family Solutions, the world's largest provider of employer-based workplace child care and early education. She lives in the Boston area with her husband and three children.
No time to look up others..but that seemed a decent find.
Good luck to your friend.