With the sheer paranoia of the PRT against any Master or emotion manipulation ability you don't think they would have gone extreme amounts of testing to see if Vicky's power has long lasting damage?
Actually, no, they probably wouldn't. For a number of cynical reasons. Private citizen, powerful, heroic image, lawyer mother, established ally they don't want to alienate in a shitty city, etc etc etc.
But... suppose they did. Even if they did, they could test her, determine that it has no lasting damage, and it
still be used to mold people. Pavlovian conditioning is what's being proposed here. It is
explicitly a process by which you use 100% not-permanent effects to ultimately create lasting changes in behavior. No powers even required, so any amount can only help.
In fact, it is directly paralleled in-story with Cherish.
Cherish's power is also supposed to be transient, to not last, but she intends to work around that with the S9 using the same mechanism: feel-good when people do what she wants, feel-bad when they don't. Like dog treats. The artificial feelings don't last, but the experiences and memories do, and over time they shape the victims. It's all but stated this would have worked, if Bonesaw wasn't 1 step ahead of her.
It's important to understand that if Glory Girl was doing this, it would not be a conscious thing.
"She radiates an energy that makes her allies more inclined to like, respect and look up to her, while making her terrifying and intimidating to her enemies."
Amy is a very unhappy girl, but every time she is in the presence of her sister, she feels positive emotions towards her. Even if those emotions are artificial, even if they wouldn't produce any measurable influence in even a prolonged test, they would still generate a Pavlovian response. It's
literally just how it works.
Whether it's powers, cocaine, or chocolate treats, if you're always happier around Vicky then your brain will associate Vicky with happiness, to the point you'll be happy with Vicky even in the absence of the stimulant (aura) that was previously being used.
It's nothing that hasn't been proven in real life, to the point of even conditioning humans to experience typically involuntary things on
verbal command. (the most obvious example would unfortunately be a bit lewd)
As this is an indirect and slow thing, it wouldn't change anyone's personality. Her father still has his mental disorder, her mother is still a bitch, and Amy is still depressed. None of them start slavering at Vicky's toes. Even so, her power could have a very real influence on how they perceive Victoria over time. A fitting influence for Worm, even: her triggering ultimately from a need to
be a hero only to have all hero worship tainted by the question of whether it's entirely 'real'.
Did it make Amy love her? Probably not all by itself. Would Amy have latched onto her over literally everyone else if Vicky didn't
literally radiate feel-good? To the point that she feels zero romantic interest in anyone else of any gender ever.
Maybe. Maybe not.