If it is Cystitis I read on another forum that someone was advised to buy the human medication that you can buy in sachets, make sure it is sodium citrate based, seperate a sachete into three portions dilute one of the portions into about 50 ml water and syringe in throughout the day this will disperse the crystals breaking them down so she can pass them, the same it would work in a human. I actually thought my pig had Cystitis and did this I added a little cranberry juice to the water also, she was peeing and pooping well after, it didnt harm her in any way and she actually liked the taste, she easily took 6 ml at a time. you will need to treat it over 3 days, using the portions you devided. the pack I bought was in a green and white box called Cystitis relief, sugar free with a Chemmart Pharmacy blue and yellow make tag in the corner, it contained 28x4 g sachets, you should be able to pick a box up in any pharmacy, it dosnt have to be that make but just make sure it is sodium citrate based.
I wish her well with her recovery.