Is all fluid discharged after waking up from sleep considered maniyy, or must it possess the specific characteristics of maniyy?

If she finds a fluid that has the characteristics of mani (seminal fluid), then it is mani, which necessitates ghusl (ritual bath). If it has the characteristics of madhi (pre-seminal fluid), then it is madhi, which necessitates istinja' (washing the private parts) and wudu' (ablution). If it is from the vaginal discharges, then it only necessitates wudu'. If she is unsure whether it is mani or something else, she may choose, and assign it the ruling she wishes.