If you don't think she'll warm up to them, even with a tasty treat... then perhaps you could try taking her favorite toy with you when you go outside. Anything treats or otherwise that will make her pay attention to you instead of the neighbors when you walk out your door. She has probably done it for so long its more of a habit now. Or she could be reacting to your own reactions. Such as if you have her on a leash and when she starts barking etc you are holding tension on it. A dog will react if they sense tension or apprehension in you etc. I would try taking a treat, a really good one, and holding it in my hand where she can smell it but not necessarily eat the whole thing. Just kinda nibble it until you are far enough away that she will not notice she even passed by those neighbors. Then give her lots of praise along with the rest of the treat. If you do this long enough and consistantly she should do lots better. Just try and keep her so occupied she doesnt have a chance to bark. This way its more of a positive thing when going outdoors. Hope something I've said may help you. I've had a similiar problem with my Aust./German shephard mix.