[anonymously]

Please check the search engine here for “struvite” “bladder stones” or click on my avatar and read my posts on this subject , this topic comes up about once a week.
However, I am not a veterinarian, so please check with your vet before making any changes to your dog’s treatment.
I wouldn’t mess with supplements, keep the diet simple.
There are prescription meds that your vet could subscribe after surgery if her condition is stubborn. I would ask about that.

Example: /forums/search/struvite/

There is NO magic supplement. The trick is to add water to each meal 3-4 small meals per day soaked in water, don’t measure, just fill the small bowl, the dog will lap it up to get to the food.
The dog must be taken out to void (pee) ideally every 2 hours during the day. At bedtime and first thing in the morning. Stagnant conditions in the bladder are conducive to stone formation.
There is nothing wrong with Royal Canin Urinary SO. If you get the dry, soak it in water overnight then add water too. Once the dog is stable, few months to a year, you can talk to your vet about adding something tasty to the prescription food, like cooked chopped up chicken breast or some other lean meat.

http://skeptvet.com/Blog/?s=cranberry

Excerpts from previous posts:

As your vet will confirm, dogs that have a tendency to make bladder stones have to be on a special diet the rest of their lives, this is a serious condition and it just doesn’t go away.

I would comply with the prescription food for now.
And don’t forget, water, water, and more water added to the diet. Ask the vet ….but I believe this helps big time. And frequent bathroom breaks, opportunities to urinate.

“My dog had both (struvite and calcium oxalate), no symptoms till the age of 11, started with UTIs. He has had no recurrences in 4 years since his emergency surgery.
In fact, I just took him in for a geriatric workup and his lab work was good”.

“I was afraid the vet would want to do x-rays and test his urine…..but he said as long as he is not having symptoms we are not going there (he’s too old to tolerate another surgery)”
“I do monitor his urination habits and check for normal flow, stream, amount. If I note any discomfort I will take him to the vet”.

“There is a genetic component and some breeds are more prone to bladder stones.

“Anyway, if you do nothing else, add water and take her out to urinate frequently.
I went along with the prescription diet for almost a year, since then he has been on Nutrisca salmon and chickpea kibble soaked with water +, I use the wet food too”
PS: Soak the kibble, even the prescription food in water overnight in the fridg, add more water prior to serving. Keep the bladder flushed. Maybe add a little canned prescription food as a topper.

PS: If he is overweight or inactive, start taking her for daily walks, that helps too.