Hi try redirecting her attention. Start inside your home with some yummy smelly treats and teach her to "watch me" (I use the word focus) Show her the treat and say watch me and bring the treat up to your face. When she looks up at you give her the treat. Do this over and over until she looks at you instead of the treat. Then take her out where she will receive the stimulus you want with a pocket full of small yummies and try it there. If she obeys the watch me command give her the treat. If not, turn her around and walk away from what she's barking at and give her the command again. It shouldn't take too long for her to understand that "watch me" = GOODIES!