I think at this point your mothers lymphatic system is extremely toxic (acidic) I would slow down on the herbs as some of them have a potential for toxicity as they seem not to be assimilating properly!
I would seriously consider mineral baths and the coffee enemas or a colonics!
And yes I would consider urine therapy as this point ,it gives the liver a needed rest to help recover from the toxic state it is in!
(Edit/link)The link below is about hydrotherapy or mineral baths, the serious condition of your mothers lymphatic system is in I beleive these baths are critical and may offer almost immediate relief !