Alanna can do a lot. She can summon fire, heal, and cast whatever spell the author decided she needed to cast at that time. However, her powers are tied directly to her energy, so if she over uses, she can colapse or even die. Healing wise, she can take care of light fevers/colds, bruises, scrapes, etc. She also can help speed along the recover of broken bones. The magic that we see her do off the top of my head includes opening locks, transforming a shirt into fire wood, some TK ability, and a wall like thing that kept a god out. So pretty much? Random spells. She has no formal training, so it's very, very random.