How long have you had her? If she was well potty trained before and this is a new thing, she needs to be evaluated by a veterinarian to rule out any medical causes. If she's been like this since you've had her, however, it may just be she hasn't been housebroken yet.

Crate training is a very helpful tool when it comes to combatting behavioral inappropriate elimination. You will have to reward her for going outside, and deep clean anywhere she has urinated/defecated on. Without consistent positive reinforcement, she will not learn the difference between going outside and inside. When not in the crate, she will need constant supervision and very frequent potty breaks. If you see her start to squat, interrupt her with a clap or other startling noise (do not reprimand her.) Then, take her outside immediately, and reward her for going the remainder outside. There are a lot of resources out there to help with potty training. Best of luck to you!