First off - take her to the vet and make sure she doesn't have a bladder infection. If all is clear, then what I suggest doing for a while is keeping her in the crate until you are ready to take her outside. Try to keep an even pattern/time shedule, as well. When she goes to the bathroom outside, reward her... make her feel like the best dog in the world. If she goes in the house, scold her and take her outside. It's very important that you do it immediately or else she'll have no idea what you're yelling at her about. Even though she has already peed in the house and probably won't pee again outside, she will still get the hint. After a while of keeping a good schedule, her internal clock will know you're about to let her out. She'll start to send you signals about wanting to go out - because she'll know it's time. I crate trained my dog, but she sleeps with me at night. Like clockwork, she wakes me up at the same time everyday, even weekends.
She knows when her pee-time is, LOL.
I hope it all works out.. be patient!!