Pre-diabetic A1c. Begining this journey. Confused

NOT SEEKING MEDICAL ADVICE, just ideas.

Any ideas as to why a healthy 24 year old female would have a pre-diabetic A1c (5.7), other than genetics or diet?

Really healthy eating. Low glycemic (not keto) for a couple years. No white carbs. No sugar except trace amount in dressings and such.

I am currently at work, but I can stop by to answer questions occasionally

I have NOT seen a provider yet. This was a home A1c test done on the suggestion of a admin in a Facebook group I am in for the healthy eating plan I am on, due to some issues/symptoms? I had been having

Any other suggestions/thoughts, ect would be welcome.

I do plan on seeing my provider probably at some point, but I want to work to try to figure some things out first.

Thanks!