Disregard what that breeder told you and spend time with that pup. She is a baby right now and needs your time, since she did not get the opportunity to spend this time with her littermates. I have heard SO many horror stories of people who thought you had to ignore these dogs to the point where they become semi-feral. They might be well-bounded with stock, but can't be handled by the owner or taken by car to a vet. I, for one, do NOT want a 150 pound dog on my place that is not bonded to me! Don't worry....she will be fine as a LGD if she loves you too. Different people have different situations. I know of some people who's LGD might need to be on duty only during the day, when the stock is out in the pasture. At night, the chickens/sheep/goats might be locked in a secure barn and the LGD sleeps in the house. For many people, one of their LDGs might be a show dog too....so it's gone some weekends while the stock are either confined or guarded by some other LDG. There are no hard and fast rules with these dogs!! Just expose that pup to as many different situations (safe ones, to build confidence) and you will end up with a well-rounded dog.
My own Anatolians are 6 months old now. I want them to be really versatile so I switch them around all the time. Eli might spend time in the pen near the house, next to a ram I have while Isaac spends time in the pasture. Then I'll switch them around. I might keep them separated for 2 or 3 weeks at a time, then I'll put them back together in the same pen. I want them to be perfectly happy apart, with stock only, or together either with or without stock. Isaac goes for rides in the truck with me a lot....he LOVES it! Eli will be entered into AKC shows later on but he rarely gets to go for rides because he does not like it. Both of them get to go for walks (on leash) and both are learning basic obedience commands and doing quite well with that so far. I simply adore these pups. they are so unlike any breed I have ever had. when I go out to the pasture and sit on the ground, they both come over to get loved on. Neither of them is jumpy bouncy puppy...constantly licking....they are both calm and sweet. I simply adore them. If I got rid of my sheep today, these dogs would stay here as pets for the rest of their lives.