That would seem reasonable, except that I'd have a little trouble seeing verbal encouragement, alone, as aiding and abetting a criminal act. Providing the gun, disposing of a body, etc., these I would consider 'aiding and abetting' a criminal act. Giving verbal instructions I could accept (she may have done this) as aiding and abetting. But verbal encouragement, alone, … I'm not seeing that as aiding and abetting.
Between two equals, yes. Point taken.
However, between unequal persons an obligation is owing for the stronger to at least be careful of the weaker.