By going through the yoders chiropractic business. The evidence appears to indicate she spiked a Protein Shake with so much colchicine that Mary Yoder overdosed almost immediately. When kaity tried to throw off investigators by writing the anonymous letters, she didnt realize the typewriter could be tied back to her. She also didnt know that the email address, The One she thought could keep her anonymous, would not only reveal her identity, it would show how she searched online for the colchicine, a Murder Weapon she thought no one would ever discover. Finally, despite all her attempts to frame Adam Yoder for the murder, kaitys dna, not adams, was on the key pieces of evidence. Groah i had such a tough time thinking that she would do that because she was such she was such a sweet girl in that office