Plzz help me i dont want to get a puppy nomore and my gramma says i still have to get rd of her help!!!!!!!!?

ok i just noe that my bunny is cuter so i am not gonna get a maltese and i am going to keep my bunny but my gramma still say i have to get rid of her wat should i say i really actually love my bunny but my gramma doesnt and plus its to hot to keeep her outside and she stays in my room and my gramma says it stink i clean her cage and then we need to buy more litter and we are struggling with money and plzzzz help me wat to do to help my bunny be happy and let me hold her and where can i try to get litter cheap but good