Felt Her Spirit Is In My Home

On Feb 1st of this year, my sister in law of 18 years passed away suddenly. Since that time I've felt that her spirit is in my home. I dreamed of her one night and is wasn't even like a dream. We talked and she said things to me that made perfect sense. Even told me that she was putting something up. I later found out that it was her house payment book and her husband had been looking for it. I hugged her and awoke sobbing uncontrollably. I could still feel the texture of her hair against the palm of my hand. Since then we've been having strange happenings in our home. Toy guns making popping noises and water faucets turning on. I feel that she's with us. Could this be true? We don't feel threatened at all, I just think that because of the things that had been going on in her life she feels that our house is the one she can hang around and be at peace. She came from a very tumultuous family and with them there would be no more peace than when she was alive. I feel that she was angry with her husband before she died. He has also recently moved her sister in his home and has begun a relationship with her. I think she's angry with them and stays with us because we don't approve of the relationship. Please someone respond with your thoughts! We just want to be at peace with her. She can stay. We just want to know if it's possible. Can we co habitat with her in a peaceful manner? Is she waiting for us to do something for her? If so how do we know what she wants from us? I just want to understand why us? Will she always be with us?