Does the yellow spot found on clothes, being semen, necessitate ghusl, especially with the inability to properly discern its smell or differentiate between the smell of semen and other discharges?

The characteristics of female maniyy (vaginal discharge that necessitates ritual bathing) are mentioned in the fatwas referred to. If a woman doubts the emission of maniyy, the default is that she remains in a state of ritual purity, and ghusl (ritual bathing) is not obligatory upon her. If something is discharged and she doubts whether it is maniyy or something else, ghusl is not obligatory upon her according to many scholars; rather, she has a choice. It appears that the questioner is afflicted with waswasah (obsessive whispering/doubts).