I'd take her in as soon as you can. Some illnesses require further blood work & testing to diagnose. It could be something wrong with her kidneys or liver (unlikely though depending on when you had her last bloodwork done & what she has ate, done & been around since then), diabetes, cushings, urinary/kidney &/or bladder infections, addisons, cancer, hypothyroidism, etc.... I don't mean to scare you, some of those can be easily treated or managed if caught early. Good luck & keep us posted.