Most likely she's just taking 5 years and assuming each year has 52 weeks:
5 x 52 = 260 weeks
That would be correct if you're just looking at 1996 to 2001, which is a span of 5 years.
You're using specific dates, but she may not be. So you probably need to clarify the exact dates that she is using. If you're looking at something like Jan 1996 to Jan 2001, then that would be 5 years, or 260 weeks.
The difference is whether she's giving you credit for the extra months from January to April of 2001.
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