Jill Schiff’s office is just beyond the kitchen, down the hall from where the dog sleeps and the kids roam when they get home from summer camp. Welcome to Schiff’s corporate annex, the place where she can baste a turkey and run a million-dollar business at the same time. She’s not your average stay-at-home mom. Schiff, 36, is growing a jewelry business and pulling double duty as a mom — or, more accurately, a "mompreneur." "I get a lot of creative energy from my kids. They egg me on. And it’s never like ‘Mom, get off the phone,’ " said...