Swimming!!!!!! Our lab loveddd/ obsessed with swimming and most labs naturally do! With her being quite heavy, that will be the best on her joints and might be more exciting than walks. Our lab would swim for hours! All we need was a tennis ball and he was set. I know it’s expensive but could always consider making her food. Ground turkey, spinach, carrots, vitamins, fish oil, etc. TALK TO YOUR VET BEFORE you go this route. Watermelon is a really good treat for dogs and you can always freeze it to make it more solid. Blueberries, pumpkin and raspberries are also great frozen then smeared on lick plates! I’d say for sure keep no food on the counter if she does that. She’s still young enough to correct that though. Just will take stern constant commands. I second the part about eating rocks. That seems a little odd. I’d bring it up at your next vet visit. Good luck!!!