Temperament. Hmm! Well, it's risky to make generalizations, because there are always exceptions. Most rabbits are fine with petting, but aren't keen on being picked up. Most learn to tolerate it, and some even get to liking it, eventually. Most of the Dwarfs I've handled have been more on the high-energy end of the rabbit scale. We have one that used to pace the front of his cage all day - we called him the Energizer bunny! He was an extreme example, most aren't that wound up. I have known only a few genuinely vicious rabbits, and they were unfortunately all Netherland Dwarfs. On the other side of the coin, some of the sweetest rabbits I have handled have been Dwarfs, too. My daughter is my #1 bunny wrangler, and several of her favorites in the rabbitry are Netherland Dwarfs. There are a couple (does, particularly) that she steers clear of, as well. I knew one Dwarf that was "best buds" with a Yorkie! I think, "a lot of character in a small package" pretty much sums the Dwarf up.
They may be the smallest rabbit breed, but Netherland Dwarfs are not supposed to be fragile. They are meant to be sturdy, solid, compact little animals. The breed standard allows a one-and-one-half pound minimum adult weight for show purposes. It seems that some people are always trying to see just how small they can make them. I have seen one pound adult Dwarfs, but they looked dainty to me. Because of their short faces, malocclusions (badly aligned teeth) are a little more common in Dwarfs, so this may be something you need to check. Other than that, this breed is as healthy as any other breed, when fed and housed properly. I usually don't recommend a Dwarf for a family with small children, because it seems like little ones are always wanting to pick the bunny up. Without very careful supervision, this could result in painful scratches for the child, and possibly fatal injuries to the rabbit! Larger rabbits are a little more intimidating, small children are more likely to be satified with just petting them. That is really the only reason I would steer people away from Dwarfs in general.
Looks like your girl is making herself at home!