What is the ruling concerning blood that appeared 48 days after postpartum bleeding, then menstruation for 6 days after a 15-day break, then brownish blood for a day and a night a week later?

The maximum duration of postpartum bleeding (nifas (definition)) is forty days. Anything beyond that is not considered menstruation (hayd) unless it coincides with the usual time of her period. What the questioner saw after fifteen days is considered menstruation because it occurred after a period of purity exceeding thirteen days (the minimum period of purity). As for the discharge after one week of the cessation of blood, it is not considered menstruation unless it occurs during the usual time of her period, because brownish discharge (kudra) is not considered menstruation unless it is during the usual time of her period or immediately follows blood.