They caught her through the terrier message board/chat room she was in. Local authorities got a tip from another poster from that board in N. Carolina. The got her address through the ISP.
That's also how she got in touch with the victim. The victim had pics of herself up on the boards, so Ms. Crazy-lady (who had a misscarriage and was still telling her family she was pregnant) knew she was pregnant. She contacted the victim, saying she wanted to buy a terrier. They agreed to meet at the victims house....which they did :/
Story from CNN.com:
http://www.cnn.com/2004/LAW/12/19/mi...tus/index.html