Once she get's older and bigger, I suggest using a prong collar for walking on the leash, sit, and stay...more important stuff like that. I also suggest using a shock collar for when you're teaching her to come when off leash.Yes, but I need to get better ones because she's not crazy about the ones we have
In my opinion, dogs won't listen as well when training with treats, they'll be expecting treats every time you do something, and you're not always going to have them with you. Therefore they may not listen all the time because they may think you won't have a treat. Treat training is good at a young age though.
So that's just my thoughts!