It could be the new environment. It could be that she was never house trained. Either way, you have to train her. You MUST keep an eye on her. You must take her outside once an hour to let her pee and whatever else. ALWAYS praise her heavily when she does what she is supposed.
NEVER scold her for doing it wroing. She always does it wrong because she hasn't been taught what is right. When you scold her the lesson she learns is "Never pee or potty in front of humans" so she will start going off somewhere in the house away from you and do her business. If you catch her in the act, stop her and take her outisde. Don't fuss at her ... "no, no, no" in a calm voice is enough talking. Don't just "put her into the garden", go out with her and stay with her until she does her business so you can praise and reward when she does good.
I suggest getting her a crate and letting her sleep in your bedroom. In the wild she would never be alone at that age. She is not mature enough to handle being left alone and it causes her to not sleep well. Also if she is in the bedroom, you can hear her stirring in the middle of the night and take her outside.
Everytime she pees or potties in the house you MUST get the proper chemicals and remove any odor left as it tells her this is a place to do it.