Furthermore, it's not just the people she cares deeply for that she will make sacrifices for. She is more than willing to give up her life, health, and well-being to save the world, the universe, or simply to protect a few people. She insisted that the Doctor perform a risky maneuver to save the world from the Slitheen plot even though it very likely would have resulted in her death, and despite the fact that letting go of the magna clamps would very likely result in her death (worse, in being trapped in an oblivion the Doctor himself characterized as 'hell'), Rose let go to fix the lever and ensure that all of the Daleks and the Cybermen would be flushed from the universe. Indeed, if not for the last minute return of Pete, she would have sacrificed her life to ensure the completion of the void program.

While Rose is no genius, she is clever. She takes to new things quickly, and learns intuitively, and is highly adaptable, even to things that seem completely mad to her. When it comes to matters of the heart and emotion, she has an innate ability to understand and relate to almost anyone, and with that connection, she can help. From providing an ideal companion to a lonely nine hundred year old immortal, to leading an abandoned Dalek to peace, to leading an alternate Donna to realize her potential even without the Doctor's presence, helping people is something that comes naturally to her. She picked up a good deal about alien culture and technology on her journeys with the Doctor, and more than that, she picked up a good deal of the Doctor's leadership skills. When separated from him on the Sanctuary base, she organized the survivors together and took charge of the situation, saving as many people there as she could, and when dealing with the Isolus when the Doctor was turned into a living cartoon, she worked out the answer to how to help the Isolus get home before it could turn the rest of the world into drawings as well, and implemented the plan on her own. All of these things work together to make her a prime candidate not only for Torchwood work but for UNIT, which she also took charge of when interacting with them.

Rose is, and always has been proactive and resourceful. She doesn't wait for permission, she doesn't just run away from danger and hide, and she doesn't sit by and let things happen. Not even when she's told to sit and wait. She doesn't just wait to be rescued unless she has no other choice, even if it means getting into more trouble, and she doesn't simply give up and give in to self-pity and misery. She orchestrates and organizes and leads if no one else will, she fights even when no one else stands, and will use whatever she's given to do whatever she needs to.

Her years with the Doctor taught her a number of his mannerisms without her quite realizing it. She refuses to be saluted, she knows how to ramble and talk about nothing to distract or defuse situations, she can make the tough decisions when she needs to--and know when those times are, and can handle herself completely independently. The gentleness, innocence, and the cynicism that she originally possessed when she met the Doctor melted away to something harder and stronger over the years, and the innocent disbelief changed to an understanding that anything in the universe just might happen. Even if the Doctor himself says it won't.

Other: She's...mostly happily stuck in a parallel universe from the rest of her cast, so she should find the nexus-community a welcome thing to communicate with the others out there, and her own reality hopping days should mean it's...not a huge thing to her to see it connects to a whole slew of universes?

Additional Links: Um, probably the TARDIS wikia here (http://tardis.wikia.com/wiki/Rose_Tyler) would be a good source.