Your girlfriend reminds me exactly of my friend's girlfriend; not making an effort to converse with adults and only hang around with the kids. My friend always claims that his girlfriend is shy, and has an immature mindset for her age {now 28}. Your girlfriend probably doesn't even know what to say around your family members, it's definitely more of a maturity mindset problem than shyness. She probably has a difficult time relating to your family members, and when you place her next to one of them, she doesn't know what to talk about, therefore feels really uncomfortable/awkward around them. It's really hard to change someone's mindset, the way they think, and she's probably right it's hard for her to change even if she wanted to; people just don't become mature overnight, it's a process that takes dedication and time.
If you really love her as much as you claim, you should be patient. People who are shy/or insecure takes a long time to open up {could take years}, instead you can try to say/do things to help make her a more confident person first; try to always be positive and make her feel good about herself {not the delusional type}, hopefully gradually she'll come out of her shell and be more active in approaching your family members. When you're talking to her, the quality of your conversions also gives a hint to how mature she is, and how well she would be able to communicate with your family as well. Did you ever asked her why she doesn't talk to your family as much as you hoped?
Of course, you can do your best to accommodate every quality your girlfriend has and hope for better as well, but reality is, some has motive/determination to do better, some just doesn't, and for the one that doesn't it is hard to hope that they'll change for the better when they refuse to change in the first place. People are who they are; you can tell them all these philosophies, but they might never be able to absorb that in and you'll be back to square one. If everyone acknowledges what their weakness are and tries to improve, theoretically we would all converge to have one type of "perfect" personality, but that's not how reality is. Point is, you just have to accept what she is for now and give it time, 8 months isn't really a long period of time; my friend's girlfriend knows his family for years {I don't even know exactly how many years myself, probably 4yrs+} and she still has a problem communicating with his parents, but he still loves her and still sees a future for them. You have to weigh out what matters most to you, and work with the little flaws. When a relationship isn't what you've hoped for, it's not just your bf/gf's fault, you also chose to be with that person; so essentially both parties has some sort of responsibility. The type of girlfriends that can easily communicate with your family members are the ones who are more mature; the more mature they are, the easier the talk, they'll always have something to say and know what to say/do. Maturity is more of a mental concept than how they act physically, people can be cheerful and bubbly and yet can be very mature at the same time as soon as you hear them speak you'll realize that.
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