I tried askin my girls mother if i can get a small share of the taxes that involve a part of my daughter?

im not complainin bout bein wit my girl all the tym dont get me wrong.wen i was 1st taken down for cs i had proof wit receipts dat i care financially bout ma girl but the mediator howeva didnt look at myreceipts she just said dat from now on i pay my bmother 400/m.so since den ive not talkd bout it much till recently i noticed afta i lost my job i was still payin out of my savings for 6 mons no complain and i had ma girl 50% of each week.my mistake was not saving receipts since they neva cared the 1st tym and docing tym spent coz i thought dat was pety.but wen i asked her for a smallshre of the taxes she looked @ me wit the most disgustin face.honestly she isnt a bad mom to ma girl i live less than 10 min away from her wit ma new girl.she said it was uselss to even gime me anythin she will get right back in cs.do i stand a chance to get custody of her.errytym i play wit ma girl wit nail polish she nags im doin dis or im spoilin her or find sumthing else or call me to see if she ate