How do i get my dog to stop peeing on my carpet at night when im sleeping with these?

i didnt know that my 10 year old dog was peeing on my carpet untill i picked up my rug and relized the yellow spot on the bottom, found a wet pee spot on my parents light carpet one day, and found a wet spot on my dark carpet. my mom kept telling me she was but i didnt think so i have a kennel but i put my other dog in it at night i have a second kennel for her too but we dont have the door to it anymore. i brought it inside anyway and just cleaned it in the tub. what can i use for the door, even if its something that she can knock down to wake me up. i have a bunch of wood i could use but i dont have anything to cutit with. im only 14 and responsible for my dogs, besides the fact that my parents pay for everything she has speelt in my room since she was a puppy and i was just a little girl. she onky weighs 6lbs too so shes really small 5 breed mix. plz any ideas.