why my pitt was agressive toward me for 5 minutes only

Question
Im just asking for some advice on me and my pittbull. She is 1 yr and 3 months and the best thing to ever happen to me. I got her when she was 4 months and we have had the most amazing relationship. Well I had to move to my grandparents house for 1 month and i was forced to leave her with some people. They pampered and babied her the whole time with no type of rules. I went to pick her up after a month of leaving her there. She ran into the yard where i was standing, barked and growled at me but wagged her tail as if not sure about me. My first thought was she was mad at me and she was confused because she thought i had abandoned her. Understandable. well she finally came to me and greeted me but not like she used to. It was like she wasnt phased by me and when i took her in the car she was crying the whole 3 hour ride home. I tried to comfort her it didnt do anything she was too preoccupied by her surrounding and whatever she was crying for. Deep down i know it was them. They spoiled her rotten and i know i have noone else to blame but myself. My concern is she wont ever be the same with me. Do you think there is anything i can do and if so, what? Do you see something that I dont? have i really screwed her up? Its really breaking my heart. I love this dog more than any human ive come across.I was hoping you could give me some advice to mend my relationship with her or my broken heart. Thank you for your time. I hope you reply.

Answer
First, dogs do NOT feel abandoned and "mad"; you are projecting your feelings onto another species.  Dogs feel insecure, fearful and confused (among other things) but don't interpret any dog's behavior according to human emotion.  Regardless of whether or not they "babied" her, the fact is the dog was suddenly separated from her primary caregiver (you), was confused and terribly insecure, and perhaps her insecurity was rewarded (because people attempt to console dogs without understanding that you have to KNOW what you're rewarding, and if you reward anxiety, it makes the dog more anxious).  Her confusion regarding her then circumstances was demonstrated by her confused greeting toward you.  You presented yourself outdoors, therefor your scent was not readily available.  Dogs recognize us by scent, first; in fact, if a well known human presents him/herself to the family dog buck naked, the dog reacts (at first) as if the person is unknown.  Her whining during the very long trip home was more likely a reaction to her confusion and the fact that the LAST TIME she took a trip, YOU disappeared (because you had to leave her, NOT your fault!)  It isn't YOU she's reacting to, but if you continue with an uncertain relationship (from YOUR END) you will confuse her and make her very, very insecure.  Go on living your life as you did before this took place.  Go back to your normal "rules", do not interact with her with any anxiety, and within two weeks she should go back to normal behavior.  IF YOU REWARD HER FEAR and ANXIETY you will TRAIN IT and she will CONTINUE to demonstrate it.  Expect the same dog and you will get the same dog.