What is the ruling on a woman's prayer and fasting if she applies lipstick and swallows her saliva after moistening her lips with her tongue during prayer, and what is the ruling if she does not remember whether she swallowed her saliva or not?

A woman's ablution (wudu') and prayer are not invalidated merely by moistening her lips with her tongue, even if she has lipstick or anything else on them. If she does not swallow the saliva mixed with anything, its presence in the mouth does not affect the validity of the prayer, nor is her prayer invalidated by doubt about swallowing it. However, if she intentionally swallows the mixed saliva, her prayer is invalidated according to some jurists. But if she swallows it out of forgetfulness or ignorance, her prayer is not invalidated.

In summary, swallowing saliva mixed with other substances does not affect the validity of the prayer if there is no trace of the substance in the saliva itself, even if its color or smell changes due to the dye or other material.