Crate her!! or She needs to be put in a smaller room, where she wont be able to pee away from where she sleeps and eats. Dogs dont like to dirty the area they live in. Keeping her in a crate or very small room, and only taking her out to go to the bathroom should put her in the habit of going outside. You have to be really committed to this though. Make sure she knows your angry when she pees, but dont take it over the top. Also after a little while of being angry you have to forgive her, pet her and let her know shes still loved. If you dont forgive her, it could have negative affects. If you do keep her in a smaller room, you might also try putting one of the older house broken dogs in with her for an example. Youd be suprised how much a dog will learn this way. If it continues to be bad, when you catch her peeing in the house, AND ONLY WHEN YOU SEE HER DO IT, take her by hand and litterally rub her face in the pee, then immediatly put her outside. Its gross, but has a strong affect. If you dont see her pee, and its obviously been awhile, she will have forgotten what she did. Puppies dont always have the best memory.
Thats all I can think of for now, but I have very successfully housebroken all my dogs by these methods. Good Luck!!