Clicker training! It is life changing! The down side is it is awkward to hold the clicker, treats and leash - but worth it.
To prime Paisley, click-treat, repeat, repeat, repeat. You know you've got it when Paisley hears the click and looks for the treat. Make the treats very small and do this on an empty stomach.
Then ask for a behavior she knows, such as sit. As soon as she sits, click and treat. The treat must be given immediately. Move onto other behaviors she knows, just for reinforcement.
Banker sits to get his leash on, a pet peeve of mine. Rather than heel, I use "let's go." As soon as he moves, click, treat. Every couple of steps, click and treat. It makes the walks slow, but successful. With successful practice for several weeks, gradually start increasing the numbers for the reward.
Banker loved to walk on my right side, but I prefer him on my left, so "left" became a command. We added "slow" and eventually moved to "heel."
Hang in there. She is still a baby.