Beagle mix WON'T get housebroken?

We have trained a couple dogs before. We crate train. We reward, praise, etc. They have always been trained in 2 weeks. We have had this beagle mix for 6 months or so and she is about 9-10 months old (?). This dog will NOT house break. We started crate training the moment we brought her home. We take her out every 2 hours and limit her water intake. We do not hit, scold, rub her face in it, etc. It's like all the thousands of times we have taken her outside mean nothing. One time (I was gone) a couple weeks ago she was asleep next to my husband and she gets up and moves and pees. Makes no sniffing or indication that she needs to go out. The same thing with poop. Unless we are staring at her rear end to see if she needs to go, she will just squat and go. She doesn't even pace or sniff for it! We have hung bells on the door and we say "out" and make her hit the bells - she now hits the bells every time we SAY out but she doesn't ever do it to GO out to let us know. She just pee'd on the carpet again while playing with our other dog after having been taken out an hour before. We use him as an example too! We say "out" to him and he gets all excited and barks, and we praise him ridiculously so she can watch and learn. Nothing has worked. I know that a dog of her age should be able to hold it and not go every hour or two but what else can we do? We have brought treats outside with us and given them to her the moment she is done and praised her like she won the lotto. Still nothing. Still pee's inside, still poops inside. Still makes and gives no indication that she even needs to. We have cleaned the spots with pet-spot cleaner to get rid of the smell and the 'accidents' (which IMO aren't accidents anymore) and it's never where her previous stain was anyway. We are out of ideas. She is very bright, she has picked up every single command easily and quickly. She knows her sit, stay, down, come, etc. Learned them faster than any other dog i've had. But why won't she go out? We keep her gated to one room or in her crate. We'd love for her to have free roam over the house but until she stops this, it's not going to happen. She doesn't have anything medically wrong with her.