Have you cleaned the areas where she marked with the right chemicals? If not, she might be just going back to mark her territory. If you have a pad that has some of her pee on it already, you could put that outside or where ever she's supposed to potty. Same thing with poo.
As you mentioned, she's still VERY young so she will have accidents from time to time. I know it can be frustrating but I think it's all part of the process so don't be discouraged.
Also... you mentioned balcony. I'm sure you've already taken precautions but just want to double check. You blocked out any openings where she might fall through, right? |