The author does an wonderful job of making the protagonist sympathetic without vilefying the mother. My heart went out to the girl as she sat and waited for her mother, knowing, on some level, that she wasn't going to arrive.
The use of flashbacks to tell the story of the girl's childhood neglect by her mother is well done. Some of the descriptions are captivating. It is amazing how much depth that the characters have, given that the story is really an interior monologue from one person's perspective. This is a book about hurt, disappointment, hope, regret and loss. Even if the reader hasn't experienced the sort of neglect that the lead character does, we can relate to her pain -- the emotions she is feeling are ones we have all felt at one time or another, for one reason or another. As such, the device of not giving her a name works really well.