I wouldn't know what the accepted ruling is around here, but I asked about this too at my table. We eventually agreed based on the following two facts:
1. she gains fast when someone is Killed.
2. she is placed After someone is killed, but Before they are removed from the table.
As she is not present when the model is Killed, we decided that she doesn't gain fast from the model that causes her to appear on the board.
Any comments?