Levitating in water is called floating.
Your power is called psychic ability. Being able to know what someone is thinking or to know what someone is about to bring are forms of psychic abilities. This means your subconscious mind is able to read the energy of people and places you're around. As for your stepmother, I wouldn't be bragging about that. It's pretty horrible. You may not have used magick to cause the hair loss, but your constant negative thoughts about her and sending her thoughts of anger and pain could very well have made her hair fall out.