[quote=@MelonHead]
You're going to have to define interacting for this to have any meaning as a limitation. Is she interacting with an object because she intends to hit it? 
[/quote]

[url=http://www.dictionary.com/browse/interacting]Interacting is a word that has [i]exactly[/i] one definition.[/url]

[quote=@MelonHead]
Can you weaken an arrow with an aura that directly effects electrical signals, even if you couldn't infer that was its capacity from me directly referencing the effect it has on listed examples of tech, and human beings? 
[/quote]

I have already stated more times than I can count, that there is a primary limitation which you did not address, and as such I had assumed that you understood it to be there and to exist and not warrant mention. Sarah is a child, and can only Abstract, or Disassociate, things she understands. If there is no reason to believe she understands an object has a property, or that she is aware that an object has a property, then there's no way she could change it. Sarah's power doesn't give her any special insight into objects, it only alters the way she interacts with them, and it is the reason Mother is still 'broken'.

[quote=@MelonHead]
Anyway, I look forward to your replies, though I must say the pause between them grows lengthier and lengthier. I worry you are committing far more energy to this than you should. Save your concerns for the GMs, I am but a bystander. 
[/quote]

The energy I'm committing is first, and foremost, to make sure I thoroughly have read and understand what is being asked of me before I answer. This is something I would do regardless of whether or not we were talking about a character. For the purpose of this character, the challenge is trying to quantify the process of abstraction as an idea in the context of a superhero filled world. [url=https://en.wikipedia.org/wiki/Abstraction_(mathematics)]Abstraction[/url] is an idea that exists in every-day reality. The power just gives the child the ability to take and use the idea. In that regard it's no different from magic, though there remains a great number of distinctions between the two. 

To address another concern: it's far from bending reality as a whole as each instance is a discrete case. The power is designed to affect Sarah and her relationship with an object specifically. While others can interact with the object as she is, it's not the intent of the power to change how they interact with the object, only how Sarah utilizes that object in their combined interaction.  

You may have guessed by now that in real life, I am a mathematician, and this concept is one that I am intimately familiar with. But that familiarity is a product of my training, and not one I can simply assume others to have. It's a very easy thing to demonstrate, but a very difficult thing to quantify out of context, since it is the nature of abstraction to take things out of context.