I would do as Maria said but I have a question: Did you live somewhere before you moved to this house where this little girl started showing up, and did you recognize that you had abilities before moving to this house where it all started?
It sounds like you had the ability to recognize and perhaps even strengthen her with some of your energy so she attached herself to you. As you began to fight back you gained strength and were eventually able to pull your energy away from her so she lost her hold on you.
Do you have any psychic shops near where you live where you can ask about meeting other psychic people who could perhaps mentor you? You do sound as if you have a tremendous amount of untrained energy that needs to be blended into your physical life.
In many of your discussions you talk about Nature and animals quite a bit, so I would imagine that is where a great deal of abilities come from. I guess many people would refer to you as a nature spirit which is perfectly fine. You also stated that you hold yourself back on purpose because of things that you have experienced in the past, and I'm going to assume that this discussion is what you have been talking about in other discussions. The very best thing that you have already learned is to not fear this darker energy because that is how they draw energy from you.
Welcome to EC, and continue to ask a lot of questions, in time you will start to gain better control of your abilities especially as you give up fearing where they may eventually lead you! Welcome Home!