There are such variations to this, and I do also believe there is still a chance she may outgrow it. However, my Bichon mix has a grade 1 luxating patella. It is more unusual in that it is a lateral luxation. It was diagnosed shortly after we got her, when she was a year old. The vet thought it may even be due to an injury.
She is now 8 1/2 and it has not progressed. It doesn’t pop out on its own, but the vet can displace it and when I pickher up, I sometimes feel it click. She also has a somewhat odd way of sitting, with that leg at funny angle. But it doesn’t seem to bother her. A couple years ago, I talked to the vet about trying her in agility and he thought it would be a good idea and may help strengthen the muscles in that area. As you can see from the picture, that has been a success.
So far so good with her, but time could change that. There are many people here whos3 dogs have had surgeries to repair a luxating patella. I do think your pup is too young to determine if it is a problem yet. Good for you to do the research in anticipation.