Like you said, if a cat pissed on it unfortunately in the shape its in and since it's very early on maybe best to start another one and scrap this one. Sorry maybe not the answer you are looking for but that's what I'd do. If you want to keep it going then you'll need to take extra care, cut down on the nutrients, keep her out of the heat but yet again she may be stunted for life or will take multiple weeks just to recover.