The Usenet Oracle has pondered your question deeply.
Your question was:

> Oh great Oracle who could have any girl you liked if Lisa wasn't waiting at
> home to ask where you'd been, please tell me,
> 
> Why won't Amy talk to me?

And in response, thus spake the Oracle:

} Dear Supplicant:
} 
} She's telepathic.  Amy is attempting to send you her brainwaves, but your
} reception is fouled up by your constant and intense erotic thoughts.  To clear
} your mind of these thoughts, purchase several naked pictures of Tony Danza and
} George Burns and concentrate deeply on them for several hours a day.
} 
} Hopefully, this will clear up the channel and allow her thoughts to flow into
} yours.  If it still doesn't work, seriously consider acquiring pictures of the
} cast of "Roseanne" naked.
} 
} 
} You owe the Oracle a B.A. in Communication.