She's gorgeous and great job with the training! I also have a monster with the biting me when getting treats so feel your pain! Love her attitude with the wagging tail!
The things that I know help me when training is small and SOFT treats! So my pup swallows them fast and we don't get distracted with all the crunching and chewing. Cut up hotdogs and cheese work well in a pinch.
I also work hard at only giving the command once and then letting the dog think about it. Using a clicker is a HUGE help for me cause I tend to chat and praise and give commands numerous times and praise and chat and snap fingers and and and and which is VERY distracting (apparently

) to my dogs and makes the sessions not go as well cause of the added confusion.
The clicker is MUCH clearer to my pup cause it only means one thing 100% of the time (unlike my voice blah blah blah blah). THAT was perfect and here comes the treat!
Your wonderful, clearly intelligent and happy dog would catch on to clicker training incredibly fast and I think you would be amazed how much faster all this training progresses...
Clicker Training: Marking Your Dog's Successful Behavior