In this case she can be classified under the category of...
In this case she can be classified under the category of ‘Women who have the habit of duration’. Women who have a habit of time: When a woman sees blood at a particular date but the duration of the discharge varies. This happens two months in a row. For example: A woman sees blood on the 10th of March to the 17th of March and then she sees blood on 10th of April to the 18th of April.
If blood is seen for more than 10 days, then she must decide which category (categories of women) she fits in and follow the rules from the ‘Rules for a woman in menses’ that follow: - Rules for a Woman in Menses Woman having the habit of time and duration As was mentioned earlier this is a woman who in the last 2 months has seen blood on a particular date and for a fixed duration.
When a woman under this category sees blood for 10 days then it is all haidh, but if she sees it for more than 10 days then the blood seen during the days of habit is considered part of her period and the rest is istihadha. Some scenarios of women having a ‘Habit of Time and Duration’ Scenario 1: If a woman in the last 2 months has seen blood for 7 days but this month she sees blood for 10 days, what is her duty? In this situation she should consider all 10 days as ‘haidh’.
As the flow was not more than 10 days. Scenario 2: If a woman in the last 2 months has seen blood for 8 days (Her habit is 8 days), but this month she sees blood for 13 days, what is her duty? In this situation she should consider the first 8 days as ‘haidh’ and the 5 extra days as ‘istihadha’, because the total flow was more than 10 days.