But to Kyle and Mackenzie -- she's just Mommy -- though admittedly a mommy who likes to shop and keep them well-dressed.
That's why one of her favorite new sites is Zulily.com.
"You're going to see stuff that's a little more trendy, a little more cutting edge, a little hip," Colleen says of the children's items on Zulily. "(Things) that your'e not necessarily going to buy when you're shopping at Target or a local department store."
Colleen bought a tattoo-patterned t-shirt and hoodie for Kyle for $26. That's 30% off the suggested retail.
For Mackenzie, she bought a reversible swing top and embellished jeans set at a 50% discount -- $40 for both pieces.
The sales last a couple of days, unless the inventory runs out before then. And when the discounts are big, that can happen quickly.
"Some of these big expensive products for moms, the prices are comparable to buying it on Craigslist, say, almost 50% off, sometimes almost as much as 70% off," Padilla says. "But you're getting a brand-new product."