I replied elsewhere in this thread about what canon says about Molly's social life.
Hermione and Ginny (yes, connected via Ron and Harry) sometimes appear to have some kind of friendship - especially in parts of GOF (when Ginny was still in v1.0). Maybe Ginny's (v2.0) revelation (in HBP) of Hermione's snogging with Viktor really did hurt Hermione's feelings and caused that friendship to freeze over.
As to why Rowling does this - a combination of several things: Rowling appears to be a 'chill girl' - she displays much of the internalized misogyny that characterizes this type. At the very least, she finds anything to do with girls and women unappealing so she just keeps one female character of each type and keeps interactions between them to the minimum required by the plot. Rowling writes from the POV of a boy who is late to develop an interest in the opposite sex - and doesn't do much world building beyond what he needs to know for the purpose of the plot. And despite the impression she gave in the early books, Rowling hardly knows what goes on in her world when Harry isn't looking.
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timeasmymeasure
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Date: 2012-08-20 05:45 am (UTC)Hermione and Ginny (yes, connected via Ron and Harry) sometimes appear to have some kind of friendship - especially in parts of GOF (when Ginny was still in v1.0). Maybe Ginny's (v2.0) revelation (in HBP) of Hermione's snogging with Viktor really did hurt Hermione's feelings and caused that friendship to freeze over.
As to why Rowling does this - a combination of several things: Rowling appears to be a 'chill girl' - she displays much of the internalized misogyny that characterizes this type. At the very least, she finds anything to do with girls and women unappealing so she just keeps one female character of each type and keeps interactions between them to the minimum required by the plot. Rowling writes from the POV of a boy who is late to develop an interest in the opposite sex - and doesn't do much world building beyond what he needs to know for the purpose of the plot. And despite the impression she gave in the early books, Rowling hardly knows what goes on in her world when Harry isn't looking.