Okay, so yesterday didn't go as well as planned...sorry.
The main thing I see on the UA is the pH is high.
So now that I have some history...I will give you "my opinion" on this problem.
Struvite crystals in a dogs urine...in the absence of a UTI, don't mean anything...and don't lead to anything. Acutally the crystals can form in urine as it cools. In any case, you can take the urine from 100 dogs with out UTIs and maybe 40% have crystals...doesn't mean anything. I do not agree that C/D is the correct food at this time.
Unfortunately, lots of vets treat these like they do cats, but the formula for cats, like acidifying urine and special foods...are not the treatment of choice.
Now, if this dog becomes chronic with UTIs, and struvite crystals progress calculi...then problems...but it will not be because she has crystals now...the issue relies on the infections.
A premium food that is balanced is fine. Some of my clients will occasionally use cranberry pills...but the urine acidity is not as important in dogs as cats, but it can help alittle.
The other dogs need to be on a senior food...and the dental diet can be mixed in. The cat "treats" can cause intestinal issues but not this problem.
Good luck, and thanks for waiting for my replies...I have had a harder week this week than normal and it cut into my computer time!
IF you have more questions let me know.