Day care owner on fed's 'most wanted' list

• The U.S. Marshals add Jessica Tata, 22, to its "15 Most Wanted" fugitive list
• Authorities say she fled after leaving 7 kids in her day care, where a fire began
• Investigators tried twice to talk to her before she fled, possibly to Nigeria
• The Houston fire chief has said authorities "made a mistake" in trusting Tata