[quote=@LegionPothIX]
Though, what I think is perhaps the most likely cause for concern, that you have, is that I am untested in your environment (your experience says you don't know anything about me) and that such an indirect, or abstract power, may be outside my capabilities to RP effectively and fairly. But, I can't address that concern without actually roleplaying with you.
[/quote]

Not exactly, what I'm saying is that your character can (by your own definition) bend reality. She's changing the physical properties of objects at whim with her mind, apparently this not only affects her, but also affects objects around her. For example, you described turning a fireball into something more akin to a baseball, so you're taking away heat and you're turning a gas into a solid. How much more can she do? Could she turn someone's armour into gas at whim and have it float away? What's stopping her from your definition? Could she cause someone's clothes to collapse upon them, too heavy to move? 

The difference with your power and anything else, is that the justification for other powers and actions are grounded in real world physics. Powers allow people to bend these rules in ultra specific ways, but they don't allow people to outright break them. If a person has the ability to fly, they can resist the force of gravity. They can't make bullets suddenly weigh so much they fall to the ground, or have them become so malleable they no longer have the capacity to harm someone. Your character only has to justify something in her mind, using an ultra vague skill-set, to change almost anything into anything else.

In other words, you've really given no indication of the scope of your ability, until now with your examples. Without that information, I'm entitled to my scepticism.