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It's possible that she had a later test for antibodies and that is what came out "positive" despite a negative PCR test.
I do believe that people can get it again, but I think it hasn't been around long enough for researchers to determine the approximate level of "temporary immunity" that one might get before any antibodies faded away. We are probably starting to reach that point now and may start seeing more instances of repeat infections from people who were infected early in the year (assuming the person is not doing any mitigation steps).
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