Haiz, Istihaazah & Nifaas

Q: Last year in September, October, November and December a girl bled for 7/8 days and then was spotting brown over the 10th day. The amount of days in between each haidh of hers was 22, 21, 20 days. Her tuhoor habit is 20 days and her haidh habit is 9 days.

1. In December, 10 days after her haidh she began bleeding due to a tablet. She bled for 6/7 days and then was only spotting. She counted her haidh after 20 days had passed i.e. from the 2nd 18:50 to 7th January (5 days). 12 days after that she was seeing brown like how she normally sees at the beginning of her haidh (19th) then on the 14th day (21st) she started bleeding red. So she counted her haid as follows: since she bled for 5 days at the beginning of January (which is less than her habit) and then she bled within the 15 days of tuhoor so she counted 9 days as haidh and then began counting her next haidh cycle from 20 days after the 9 days. Was her calculation correct?

2. In February she was spotting throughout her tuhoor period. So she counted her haidh after 20 days of tuhoor had passed. She started bleeding red 13 days after her last haidh. She counted her haidh after 20 days of tuhoor had passed. She stopped bleeding red on the 1st day of her haidh and was only seeing brown and spotting brown thereafter. She counted her haidh according to her haidh habit. She was spotting brown in the whole month.

3. In March she was spotting brown throughout. She started bleeding red after 21 days of tuhoor. She counted her haidh according to her habit due to the spotting exceeding the 10 days.

4. In April She counted her haidh from after 20 days and only started bleeding red after 24 days of tuhoor. In this month she was also spotting brown.

5. In May she counted her haidh after 20 days and only started bleeding red after 25 days. In this month she was spotting brown throughout as well.

Is her calculations correct for the above?

Also she has had previously confusion with certain masaail and a lot of salaah has been missed due to her not making ghusul at the correct time. Or reading salaah while she is suppose to be in the state of haidh and the opposite. Will she have to make qadhaa for all these salaah? 

Q: May I please have advice on the following: I normally get my haidh after approx 23-26 days. It starts with heavy red bleeding. However, on sunday morning (the 15th) there was a lighter brown discharge. I did not count it as haidh and performed salaah for the whole day. On Sunday evening, there was a darker brown discharge that was a bit more in quantity, so I counted that as haidh. On Monday, Tuesday, and today, there is no dark brown discharge but a rather faint light brown. I have not been reading salaah etc. My haidh according to general would have only been due at the end of this weekend or so. This brown was on the 17th clean day which is unusual for me to get so early. I feel like these 3 days have been istihaadha. I am confused whether I should start reading salaah again and not count this, or must I still count this as haidh? When red bleeding starts in may be another few days time, would I count haidh days from this past sunday (15th) or from when the red bleeding starts? Is the light brown before red counted as haidh or not? One of my apas had said that you do not count the brown before the haidh but you count the brown when the haidh is ending. Is this correct?

Q: Can you briefly explain to me the maslah of haidh according to Imaam Abu Yusuf (rahimahulah) pertaining to الطهر المتخلخل.

10 days according to Imaam Abu Hanifah (rahimahullah) and 15 days according to Imaam Abu Yusuf (rahimahullah). Also, is fatwa given on Imaam Abu Yusuf (rahimahullah) or Imaam Abu Hanifa (rahimahullah)'s قول?