What support is out there for Preschoolers not coping after divorce involving DV

My child needs help and I am so lost as to where to find it. Almost every occasion she see's her other parent or grandparents she exhibits very strange behaviours. I have been seeking help through a counsellor on how to deal with these behaviours but have come to the point where I understand her behaviours are an outlet for her anxiety/fears and feelings but I just can't seem to do enough to help her. It started with her drawing murals on walls and trashing her room while sleeping. This escalated into her believing her sister was sabotaging her and throwing her through a window. Next there was ferocious masturbation (which a report has been made to DHS about, as it occurred after visiting the other side of the family), today she threw a fit where she smashed her head several times against a metal object causing bruising to her face because I asked her to hold my hand while crossing the road before a visit with the grandparents. This is not normal behaviour for her. She has never thrown tantys that result in head banging or even throwing herself to the ground. She wasn't just looking for attention and she didn't care that she had hurt herself. This child is sweet and very well behaved most of the time so it is breaking my heart to see her switch into something so aggressive. I have tried to find services to help but have been told because she is so young there isn't much help out there. I've also been told that if she was sexually abused there would be services to help but as it is unclear at this time and we are just "watching" the situation there is no help for her. I'm so frustrated and scared for her. Does anyone know how I access services to help her?