I agree with what's said above, expect that she complained too much. In season 5, yes, but I can't recall any inappropiate whining in season 6. Dumb decisions madethat she really was too smart to make, specially at Halloween, but not too whiny for someone in her situation.
She was alone, surrounded by people that loved her, but didn't see her. She had been used to being babied by her mom for her entire life (or, you know, fake-life) then her mom dies, her sister dies, her sister's friends try to be there, but they have their own things going on. Then Buffy comes back and everyone probably assumes Buffy will be there for Dawn but she can't replace Joyce, specially not while being depressed and busy with her own things. A child is suppose to have two parents, and Dawn had a half one. And she wasn't used to that, which I guess he got by season 7, when Buffy was also more "there".
And as said in season 8, Dawn felt like Willow was like a mom to her(if I recall right), which I guess happened during the summer Buffy was dead, so during season 6 when Willow was busy being addicted and all, and as I said above, probably expected Buffy to be there, Dawn might have felt like she lost her bonus mom, missing Willow more than the others.
---------- Post added at 01:39 AM ---------- Previous post was at 01:33 AM ----------
On the one hand, many 15 year olds actually like it when they are often home alone. I know I did. Also, nothing was stopping Dawn from finding some friends of her own.
Friends and family aren't the same thing. And she did find friends... bad ones that tried to kill her and her friend. She seemed to have better ones too though.
And I think most teens like the option of being on their own, but want there to be someone waiting for them at home. Dawn didn't always have that. Her alone times weren't by her own choice.
Still, in less than a year she learned that she was not a real girl and her memories were not her own, her mother died, her father didn't even show up for the funeral, then her sister died to save Dawn, then said sister came back but was strangely cold and detached. Then the replacement parental figure that Dawn had become very attached to left, the sister revealed she had been pulled from heaven which must have made Dawn feel all the more guilty because she was supposed to die that day, not her sister. Let's just say that after all that it was a miracle Dawn didn't try to kill herself rather than just throw hissy fits and become a kleptomaniac.
I agree. Not many people seem to think about the guilt she must have felt. I can't believe the writers never touched on that.