Hi journeytohealthy,
If your HbA1C is 5.8% then it is nicely below the pre-diabetic range, so congratulations.
You seem to be eating Low Carb already. Though rather than snacking, it is better to have longish periods of no eating between meals, or even having long periods between meals if doing Time Restricted Eating aka 16:8 . Still if you must snack then at least you are snacking on the most suitable foods- I never feel guilty if I overeat (or snack) on cheese or nuts (but not Cashew nuts).and Pork Scratchings are a treat.
At 100lbs, are you at normal BMI or underweight? It seems unlikely that you actually need to lose weight.
30min of moderate exercise per day is ideal e.g. a brisk walk. Brisk means you can hold a conversation, but are unable to sing while walking at that speed.
Vigorous exercise does little to lower Blood Glucose, moderate is better as is resistance exercise e.g. squats, push-ups, weights which build muscle which can then store glucose out of the bloodstream.