I still do not get it, will I ever!

I am new to all of this.  I am so glad I found this site before I lost my mind.  I have every emotion all at once.  My husband and I have been married for 12+ years and have 2 beautiful girls.  Our girl mean the world to us- but of course you know this!  Back in October I had taken my oldest to counceling due to school bullying.  During this session she revieled to the counciler that her cousin had tried to insert a play fork up inside of her.  He was 3!!  On the way home she was not her self.  I asked her what was wrong.  She stated that Nana hurts Damien(which is the cousin).  She provided more detail than an eight year old should know!  After she said I need to tell you the truth Nana hurts me,too.  As with great etail.  I called CPS and sherrif right then.  Nana is my husband's mother who has done everything under the sun to split my husband and I up.  Since the investagation with CPS they reported that I was crazy and wanted revenge on my mother-in-law.  That set me off!! No way would anyone in thier right mind tell the child what to say.  The CPS worker just so happened to be friends with my mother-in-law.  The state would not take this into consideration and dropped the case.  This CPS worker has convinced law enforcement and the interview personal that it was all a lie.  My daughter answer all of the questions that was asked.  It blows my mind that because she never told the same story she is lying.  She is eight she has gone through Hell and back for eight years who could tell eight years of abuse in less the 45 minutes!  My youngest has not spoken about the abuse but during play therapy they have determined that sexual abuse is present.  Both of them were examined and niether have a hymen(sp?) but have not tramatic falls!!!!????  Does not make sence to me. 
While my family goes through hell every day my nephew still lives there with Nana!  It makes me sick.  Every one of Nana's kids are drug addicts and cannot tell the truth.  My husband has been clean and sober for over 1 year now and kept his soberity through all of this.  His substance abuse councelor has work with him about his childhood but he get very angry about it and cries.  He will not state why.  She and I believe he and his sibblings have all be victums.  I walked in on my mother-in-law and brother-in-law laying in bed.  She had a sexy nighty on with no underwear and he had just underwear on.  He was 26 at the time.  There is so much more to tell but will have to be at another time cause my fingers and head hurt.