Yes she was spayed at 6 months and it has got worse since.
She barks and follows and stands her ground
No, she tends to punch with closed mouth and tugs at clothes
She did a vets puppy class at 12 weeks but was always very quiet . Very Little at clubs as we can never get a place, she is obedient but not good at recalls although she does come but then it becomes a game. We have had some one to one training and have socialised her at a club as a guest and this behavior actually stated after these visits at about 5 months of age.
She is the same at home as work and only barks at men on walks.
When my wife ties her up outside a shop she does not bark and lets men pet her with threatening them.
When people arrive and she barks she is put on lead, taken to cage at home she is put in the kitchen, given a severe telling of but no beatings.
We have had 2 male visitors over the weekend and within 30 minutes she accepted them but still wanted to dominate.
Hope this helps