I wrote the Intellegence part because in the several places I have checked about the Thunderbird, it was always described as an intellegent being, but if thats a problem I have no problem changing it. 

As for her being underpowered, you could say that because it is lightning I didn't really want to risk things, as any other abilities I could think of would start to connect to the Thunderbirds ability to manipulate the weather. And I didn't intend on making it seem like a single lightning or two will make her exauhsted, I meant that if she puts a lot of focus into it and makes it into a single lightning bolt that would chain between many different people (Who those people would still be uncontrollable except for the first one, after all, lightning), but I suppose I can go and change her powers descriptions.

Her shifter appearance... I didn't quite want to have her start growing wings which is why I put focus on the lightning. And if someone were to look at her while she hovering down then they would see her as a Lightning bird of sorts, but I guess I understand what you mean. Will work on the changes immediatly.

Edit: I have made changes, both to her powers and to her shifter appearance. Hope its 100% acceptable now :D