From the Philadelphia Business Journal. In the more than two decades since she opened Malena’s Vintage Boutique in West Chester, Pennsylvania as a recent college graduate, Malena Martinez has gone from living in her parents’ house to visiting the White House. She traveled to Washington, D.C., in March as part of eBay’s Small Business Ambassador Network program, coming away with the realization that small businesses across the country are seeking support for many of the same issues she's…