No expert, but my cocker was diagnosed with low grade patella luxation in one knee when she was about a year old. So I can share my experience
I did not have surgery on her because the vet did not think it necessary with such a low degree of luxation. She has always had a slight bunnyhop when galloping, but she compensated well for her bad knee so we left it alone. I think you should discuss with your vet if surgery is the right option for your dog. It really depends on degree and on how the individual is affected.
Keeping the dog fit and avoiding overweight is important for obvious reasons. Exercising is good, it will help build the muscles around the joint and help stabilise it. Of course you should wait to exercise her until she is finished growing. But letting her run around on natural surfaces and especially uneven terrain, like in the forrest, is very good for building muscles in a balanced way
Swimming is also excellent!
My dog has lived a normal life. People have always commented on how fast and athletic she is. Only I and the vets seemed to be able to see her PL. People would see the bunny hopping if I pointed it out, but it never slowed her down and she never showed signs of discomfort.
As she got older she started getting arthrosis in the knee with PL, this will happen at some point. I noticed she started limping while trotting when she was 8 years old. At that time I started her on a veterinary diet for joint care. This improved her limping a lot, so I would have started her on it sooner had I known how good the effect is. There's really no reason to not give that diet to an adult dog, I'm not sure if it's good for a puppy though.
My girl will be 11 this summer and is still happy and energetic. Loves long walks, jumps around like cockers do. The limping is more noticeable now, and it does affect her some days after a long walk. By that I mean she will limp slightly and trot instead of running full speed which is her default. But she still compensates very well and she has not slowed down much.
I have started her on medication for arthrosis to slow down the deterioration of the joint. It's a new drug that's safer than traditional stuff and it has helped her alot. This is of course something that you will not need to consider yet, but it's good to know that there are options if/when that time comes.
I've also started supplements with glucosamin, chondroitin and omega fatty acids in addition to the vet diet that already contains these ingredients. These supplements can only help, not hurt. But again, not sure if they are suitable for a puppy so discuss with the vet before considering it.
Hope this helps your anxiety
Dr. Google is full of information, but his lack of nuance can scare the sense out of anyone! Always better to bring a list of questions to a vet you trust I think.
Sorry about the long post, here is a picture of my 10 year old crazy cocker: