"I have not been seeing her for a year" implies that up to a year ago you were dating her. The other two do not imply that you were previously dating her (though they do not exclude the possibility). "I have not seen her for a year" is relative to now.
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"I have not been seeing her for a year" implies that up to a year ago you were dating her. The other two do not imply that you were previously dating her (though they do not exclude the possibility).
"I have not seen her for a year" is relative to now.
"I had not seen her for a year" is relative to some point in the past that is understood from the context. E.g. "It was 2010. I had