No. She has renal failure. When kidneys don't work, you don't pee properly, and stuff builds up. If they've fixed it, it will start to pour out. If they haven't fixed it, the whole urinary tract will be off. Signs of Zoloft withdrawal, and you don't say if she's still off it, would more likely be nausea, disorientation, dizziness, anxiety, depression, insomnia, irritation, something that resembles the flu.