How can one make up missed prayers without missing present prayers, and is it permissible to postpone making up missed prayers while continuing to perform present prayers, due to circumstances of gas and fluid discharge from the vagina and daily fatigue?

Missed prayers must be made up immediately alongside performing the current prayers. A Muslim should make up as many as they can, without specifying a number. So, if one can make up two, three, or more days' worth of prayers, they should do so. If they can only make up, for example, three prayers, they should make those up. Some jurists hold that if there are many missed prayers, one must make up at least two days' worth of prayers per day, unless that would lead to neglecting a right, in which case it is permissible to limit it to making up one day's worth. As for someone suffering from incontinence ( سلس ), they must wash the affected area and apply something to prevent the impurity from exiting, then perform ablution after the prayer time begins, and pray. What comes out afterwards will not harm them, and they may pray as many prayers as they wish with that ablution.