"Trust", or so called "bond" starts to form a bridge from the very first day you bring your puppy home. First of all define yourself to your dog. This image has its stages: first of all - you are a foster parent to your puppy, a protector, stroking her whenever she is frightened, calming her down. Avoid pushing her if she is. Crouch to her level if you see she exhibits it and remain in this position until unknown dog with his owner dissapears, bringing yourself to her level would mean to her that you two are together and do not intend to run away. If she barks agressively, her hairs on the end - ask her to lay down, dogs calm down faster in sitting or down position. And, the most important - turn your back to the object of fear, never stare in that direction, show her that it is something to ignore.
Show her that you are a strong powerful and experienced foster parent by taking her to new places, as her biological mother would have done. Parks, towns, different streets, train her to use public transport if you can (you would need a harness with a handle for that), visit places where she can see different dogs during your walk, in this sense their number is important. But don't stop, it would be better to be on the move all the time, ignore all. It is always recommended to stay with a group of friends over first 2 years and train your dog to ignore any unknown. She should learn to heel perfectly, pay attention to the command "Heel", not to that dog she is scared of, thus she learns to pay attention to your voice rather than to the object of fear.
Then, you should know that it is typical to young females to exibit fear and agression, it will go away naturally when she's 3, bolder and physically stronger. Help her as her leader of the pack to gain bodily weight due to good appetite after hard physical and intellectual exercise, her physical development and muscular mass is a clue to gaining confidence.
I have noticed many times that intensive training builds the strongest bond with the dog. Sometimes dogs start loving a trainer more than their owner (if the handler is a trainer) only because that one teaches them something new, engages their intellect and directs their energy.
By looking at the photograph, I can say you have a very beautiful female. Good luck!