Hello Alexander, please take her to a Vet urgently. From what you are saying she is not well at all…..and could possibly have a serious infection in her uterus called Pyometra or a urinary tract infection. . Its obviously not normal for her to lose fluid like that….and it doesn’t sound like urine. Added to the other symptoms you describe its time for a Vet. Please don’t leave it any longer, if she does have Pyometra its very serious indeed.