I feel like a terrible dog owner?

Well Im crying as I write this... but anyways. I feel so bad for my dog. She's a BEAUTIFUL Bernese Mountain Dog, but i feel like I neglect her and i don't care for her. She's really old, and she stays out in the sun most of the day, and i live in Florida. I wish she could sleep with me, but she'd pee in my bed so i cant let her. Shes been fixed, but she still pee is everywhere, and her pee is REALLY big puddles. I really do love her from the bottom of my hurt and I wish i could try and make her feel loved. I touch her and shes so happy, but i rarely ever touch her cause she smells so bad. I would wash her but its so hard, and my sisters wont help me. Im such a terrible person, and i deserve ****. Shes such a good dog, and i love her so much, i wish she could have the world. I think she's sick, but i really hope not. I dont know what i should do.