@kjvbeliever87 You have to be extremely careful with over exercising a young dog. That much exercise for a dog that age can cause permanent damage to their joints. You are NOT a bad owner, please don’t take this as that! A good rule of thumb for the first year or so of a dogs life is 10 minutes of intentional exercise per month of age, so you should be doing about an hour of intentional exercise, then the rest should be free play and mental enrichment. You can do sniff games, training, snuffle mats, wobble toys, food frozen in a bowl, etc. for mental enrichment at home, I like to do about an hour of it spaced out throughout the day.
Do you have an idea of the breeds she is mixed with? It sounds like she might need more enforced naps! Puppies get overtired and act just like overtired toddlers, going a little haywire haha. Enforcing naps will help teach her an off switch, as well as rewarding calm, plus you can teach a place command to help.