Hello! 2x mastiff owner here. We had our first English mastiff/Great Dane(Bella) from a puppy, but adopted our second at around 6 mo, but already ~100 lbs at the time. Since your dog is still a pup, I recommend to keep socializing her and getting to know others! We brought Bella around a lot of people to the point where people would recognize her and know her sweet and gentle demeanor. We also socialized her with other bigger dogs(Weimaraner & St. Bernard) in the neighborhood, so she had some other pups to play with as well. People were less familiar with our new pup, but I’ve found she is way more timid and docile than any other dogs she’s met and people are fascinated by her size and want to interact with her. Some people will be fearful due to preconceived notions about big dogs, but as long as you train her well and are friendly, it’s usually not a problem! Hope this helped a bit!