Meredith had gotten Kate's hair easily. For the blood, she had pretended to teach Kate how to knit, then did a maneuver that punctured her fingers a little. When the blood gushed, Meredith swooped up and took the responsibility of wiping it. Kat was 5 years old then. Meredith promised her that she would teach her when she was old enough to handle the pin, but they never got around to doing it.
Kate passed the test. Meredith buried the knowledge and only told her when she was 14. She had expected the child to be erratic about it, or at least excited. Kate had looked at her with a calm expression on her face, and simply said, "I know."
It had stunned Meredith. It was as though she was being dealt a huge blow. She held Kate's hands and began to ask a torrent of questions.
How did she know? Who told her? Had she done anything yet? Was she mad at her grandmother for keeping it a secret? Kate said she was not angry, and simply shrugged at the rest of the questions.
