Question Summary:
Istihadha Query

Question Detail:

As salam muftisaheb My wife had irregular monthly cycle. Some time they are 8'to day 10" day Last time same happen and she had ghusl and. Start praying Now suddely after four or five days it start spoting again Pls advice me now she can pray or not Jazakallah

Answer :

In the Name of Allah, the Most Gracious, the Most Merciful.
As-salāmu ‘alaykum wa-rahmatullāhi wa-barakātuh.
At the outset, it may be beneficial to properly understand the general terms and rules pertaining to the laws of Haidh (menstrual period).
The minimum period of Haidh (menstrual period) is three days. Any bleeding lasting for less than three days will be Istihadhah (non-menstrual bleeding). The maximum menstrual period is ten complete days. Any bleeding over and above ten days will be regarded as Istihadhah. As such, Haidh will be from day 3 to day 10, and anything beyond day 10 will be regarded as Istihadhah. The minimum time between two Haidh duration is fifteen complete days which is regarded as non-menstrual period even though there is bleeding.[1]
Therefore, if one sees blood before the days of her normal cycle of Haidh or beyond the normal cycle, such days will be considered as Istihadhah.
Furthermore, Istihadhah nullifies Wudhu. During Istihadhah, a woman will perform Wudhu for every Salah time and perform her Salah and observe fasts as well.
In the enquired situation, your question is not too clear. According to our understanding, you mean four of five days after her Haidh finished, she began spotting. If our understanding is correct, the spotting will be considered as Istihadhah. Your wife will have to perform Wudhu for every Salah time and perform Salah. If our understanding is incorrect and you meant to ask something else, you may resend us an email with further clarity.
And Allah Ta’āla Knows Best
Abdullah ibn Mohammed Aijaz
Student Darul Iftaa
Baltimore, USA 
Checked and Approved by,
Mufti Ebrahim Desai.