this is the kind of message that is often urged by MNers and sometimes on here, when someone is no longer keen on keeping up a friendship/acquaintance.
i have always felt dubious about it. i would prefer to just taper off. maybe that's what she was trying to do, but you didnt take the hint, so she felt she had to be more blunt.
but there is usually some preceding events or difficulties that have led to this point.
are you sure that when you were in contact, there were no signs of dissatisfaction on her part, or differences of values, politics ?
and even if there were not, the fact that she has stunned you in this manner shews that you two have less in common than is necessary for friendship.
at least the message is clear.
that's one less b'day etc gift to bother about. good luck.