Custody battle. Help!

We have a referee hearing soon in regards to custody and parenting time. Dad is requesting 50/50 currently has eow and 3 hours a week. Does anyone have any experience dealing with FOC that could give advice? We are located in Michigan. We don't know what to expect, BM will do anything to make sure dad doesn't have more time and we don't know what she will bring to the hearing. Dad has no criminal record and has been very involved in the childs life. We can't think of anything that she could use to say why he shouldnt have 50/50. Bm has violated the current order constantly. Denying visitation, not telling dad of medical apts or giving him the childs insurance info or school meetings ect. She also doesn't care for the child. The childs teeth are decaying from never brushing them at bm house and just went to a dentist and now also has a gum infection. Bm will send the child to family members house around michigan for as long as a week. Previous bfs of bm have told us that bm gets annoyed easily with the child and tells her to shut up and that's why she sends her away for weeks at a time. Bm also constantly is moving men in and out of the house every 3ish months. The child gets so upset she purposely wets herself at bm but not at our home. The child also expresses to us that mommy hurts her feelings and that she hates her moms current bf. The child is too young for a judge to take the childs wishes into consideration though. As the date gets closer we get more nervous and would like to talk to someone who's dealt with referee hearings or FOC custody in general. Bm is psychotic(literally, she's in therapy because she's crazy and has so many issues mentally) and only wants to make sure dad doesn't get more time because she knows she will lose child support and government assistance. She currently lives in government housing, gets food stamps& WIC, insurance, schooling and daycare all paid by dhs. No, I'm no bashing moms who need the help. But she purposely works temp and part time jobs(barely 20 hrs a week) so she can live off child support and gov assistance. We just want stability for the child and for the child to be with loving parents not bounced around houses every week and its heartbreaking that bm is so money hungry and has so much hate for dad (she wants to be with him to have another baby but he said no) that she's willing to hurt their child and keep baby from a loving dad.

Any advice is welcome, even if its not something I'd wanna hear! I'm desperately nervous