Magicenergy, One thing you might try first, is to settle your emotions. If your emotions are out of control (you are overly upset, understandably), then any magic or astral projection you try to do could go terribly wrong.
May I recommend you go to a place in nature that you and your mother would have both enjoyed, meditate to calm yourself, then just talk to her. Try to keep the positive memories and thoughts of her in your heart. Tell her everything you need to. Be still and listen. Even on two different planes it is possible to hear. Once you feel some relief, some connection that settles your emotions and gives you more joy, then try the astral.