i was just confused because, she was (and still is) completely 100% cool with my grandparents, my one sister, 2 of my brothers, my mom, stepdad, one of our best friends, and my aunt. and that was from the first time she met them. with my one brother and sister, she about wants nothing to do with them. (she shows no aggression, just "nervous" like, actions
It could be that they remind her of someone in her past that mistreated her.
its weird bc the only real people she is REALLY iffy with is people in petstores that just come up to her, and think "oh i can pet this dog, she'll be fine"
You WANT to get her out and work on building her comfort and confidence with strangers but you have to do it in a way that won't set her back by mistake.
Try going to the pet store right before they close or right after they open. Less people - less stress on her. Bring with some REALLY yummy treats - like pieces of hot dog or chunks of cooked chicken. Go into the store by yourself first and ask a couple of the staff if they would help you work on her. If they say yes give them some of the treats. Tell them to NOT talk to the dog, just hold out the treat for her. Go bring in the dog and calmly walk up to the person. Talk to them in a normal voice and let them give the treats.
You want her to see strangers as treat machines first.
After she starts approaching people with more confidence, then you can ask them to talk to her.
The idea is to SLOWLY build her confidence. When dealing with a problem like fear you should only expect baby steps in the beginning. If you push too hard and the dog relapses they will go backwards in GIANT STEPS.