The Forgetful Mind
If Clover wants to "force" the memories from Koln's mind then this is the ability to use. Here is the description as it is described in the book. You would have to spend a Willpower point to make the ability do what you want, otherwise it's random based on percent.
Benefit: By locking gazes you can add, alter, or erase memories of a single target. You must take the time in-character to explain to the person what they remember happening; it is not a telepathic transference. The target makes a Will save and if they fail you roll a percentile dice to see what the effects are.
d% Effect
01–10 Erases a single memory for one day.
11–20 Will remove but not alter memory.
21–50 You can make slight changes to the memory.
51–70 You can alter the entire scene from subject's memory.
71–100 You can reconstruct period's of the subject's entire life.
Ventrue: The target takes a –4 penalty to their Will save
Action: Standard
Action: Attack Action
Cost: 0 Blood Points
Duration: Instantaneous