Urine is ruining my mattress!!

My daughter sleeps with me at night and wets the bed alot. I have bought mattress covers that didnt work. I scrub my mattress almost daily but the odor is unbearable. I am losing my mind because I don't know what else to do and no matter how much I scrub the odor is still there. My mattress reaks!!!!! Any recommendations on a GOOD WATERPROOF cover, urine remover, anything?? How do I get the smell out?? I need help ladies because I cant afford a new mattress right now 😔