So heres the story, some valley girl npc was possesed by some strange magic that gave her the odd ability to make any kind of lipstick explosive, as in write on a surface with it and kablooey, touch a girls lips and boom etc. The WCV trying to be a good samaritan to this otherwise innocent woman made her fear lipstick to a deathly degree.
Later on her friends with lipstick on try to help her get up after falling, she flails being afraid of the lipstick her friend has on and boom her friends face explodes on contact with her hand.
The wizard now wants to undo the WCV's mental changes and take a different approach... Does this count as messing with her mind though and technically breaking a law? Wizards are usually allowed to dispel another wizard's effects on a person but what if they are mental in nature? Is it still just dispelling or is it now a lawbreaking affair?
One part that makes this really hard is that it's flat out against the third law to even look in there, so even if you aren't breaking the fourth law when you're in there how do you figure out how to do it while not looking?You construct an elaborate thaum ritual that will reveal to the Sight the traces of energy still chaining her mind, then you undo those bindings.
You construct an elaborate thaum ritual
That's assuming that there's a construct that's still there and working. What I would assume is that the WCV simply used the existing reactions and inclinations and then twisted them to create a fear response to a relatively innocuous thing like one would do if one was trying to do this kind of thing without magic. Were I GMing in this particular situation I would rule that the damage was already done and now there's no spell over her, but simply scarring in her mind.The "twist" is the "construct", and yeah it would depend on how long ago the "fear whammy" was laid.
I'd see that the WCV did an extreme consequence - "lipstick Phobia". Mundane methods would work better. Use Empathy, a psycologist and cure her of her phobia. On that note, the wizard could use Thaum. to boost his Empathy to help...can Thaum. give you the equivalent of the psychologist stunt???
Ironically the WCV who did this is a psychologist in character and out of character.
Without the "lasting emotion" section of incite emotion however WCV powers are quite temporary, so I suppose one could imagine them as a construct that you could see in the sight and dispel...
Lasting emotion was used in this case however... Which I think in vanilla rules is still somewhat temporary. However the roll was epic enough +9 vs a 2 defense, that I allowed it to last for much longer.
I think the sight is probably enough of a deterrent if I explain that the complexity of what he'd be trying to deal with was phenomenal enough to overpower a normal wizard's mind... It would just be pretty lame for one character to be able to undo everything the other does because they don't like it. Complexity 9 in the sight on top of what the person normally looks like as well, then including the strange lipstick mojo.
BTW they decided to just cut her off from the lipstick mojo instead, it is now in a phylactery. The npc is still terrified of lipstick though.
My 2 cents.
From the source material, it seems that magic, when applied to minds and emotions, is a sledgehammer or chainsaw. Even with the best intentions and very fine control, it would be impossible for a wizard to successfully alter a mind magically without doing a lot of other damage.
Unless the wizard had a LOT of practice in doing so; which would leave a lot of mind-damaged victims in the process.
So, even though your wizard has very good intentions, and is trying to undo something rather than impose something...he/she's likely to do more harm than good. Which is one of the reasons why the Fourth Law exists. Not merely to prevent black magicians from creating a bunch of mind-controlled thralls; but to prevent a lot of tragedy at the hands of well-meaning wizards.