Blood not flowing for few days during one's haidh
Q: Does a woman have to pray during the periods of dryness during the beginning of her menses? For example, a woman who normally has a heavy period that lasts over a week, notices a small burst of blood during the time she is expecting her period, but then experiences a day of two of dryness (though she expects her period will resume), then the blood starts really flowing.
Does she have to pray during the day or two? If so, does she have to make ghusl before praying? How many days is the period of purity according to the hanafi Madhab?
Lastly, does a woman consider her menses started if the blood is still in the inside of her private part (has not yet flowed to the outer, visible part)? For example, if she inserts a piece of tissue into the inner part of her private part (inside the hole, where it is not visible) and it comes back with blood, but the blood does not flow to the outer part for about half of a day (such that if she wipes the outer part, the tissue comes back clean), is she still considered on her period during this time?