Tawnia saw what Amy's association with the A-Team did for her career and wanted the same boost. She took advantage of some information sources at a place where she was working on an unrelated story and used those to get in touch with the A-Team and demand in.
Tawnia was willing to get cozy with the bad guy in order to further the A-Team's missions.
She may have occasionally dated Ted, a deputy D.A.
Tawnia: Amy was right! The word "commitment" can ward Templeton Peck off faster than a can of Mace.
Hannibal: (to B.A.) Do you know how to find that address?
Tawnia: (interrupting) I do! I... hang out at the beach quite a bit.