when asking for advice one should generally refrain from calling them a dumbass, what does it make you if your seeking wisdom from an idiot?
furthermore kitten, when i said the kindest way possible, i meant i would do it in a way where the target would never be able to link it back to me, they would never know it was me putting screws in their tire, or me, dropping rumors about them at work, or me, leaving little tidbits of information that raise questions of their state of mind, morality, etc... they would see things going down hill but never attach it to me..
I'm not so prideful that i need to rub my victory in their faces... infact id take it a step further and even be the person there to comfort her when shes low.... gaining their trust and controling them in the process... but trully just seeing them lose credit and spiral downward is enough to satisfy my urge for revenge... and once they're at their lowest with no chance of return... thats when i'll look her in the eyes and smile... "karma, what can ya do?"... and then... they will know, but never have proof...