She held her ground at his approach, bending her knees slightly and rising onto the balls of her feet in case he decided to attack. He didn't seem like he was going to attack, though, so rather than make the first move she simply prepared herself for the possibility of having to fight. And people thought she never listened to her Uncle Luke's advice that striking first wasn't always the wisest course of action.
Blinking, her brow furrowed slightly as he rambled, trying to keep up with his excited questions and exclamations, only to tighten her grip on her weapon when he suddenly changed forms again. Being so close she really felt the change through the Force but, instead of a surge in power, it felt like the exact opposite.
Which made sense, she decided as she was suddenly face to face with what looked to be a regular human male around her own age. He wasn't some kind of creature. He was just a... guy.
With a really cool device that she instantly wanted to take apart.
"Okay," she finally spoke, "I'll go first, then it's your turn. Yes, I'm a Jedi. The name is Jaina Solo. This is a real lightsaber." De-activating the blade, she held her hand out, palm facing upward with the handle resting in it so he could see for himself. "It's not a trick or a joke - Force only knows why someone on this rock would joke about something like that - it's real." Using the Force, she sent the weapon back to its place on her belt as her arms crossed her chest.
"Now your turn," she reminded him. "What is that," she nodded toward Omnitrix, "and who are you?"