Q: If a lady experiences white discharge during the day and the same is experienced during the night, is a ghusl fard for the discharge experienced during the night? Even though it is the same colour as the discharge during the day. Does the ruling differ if it is yellow or white discharge?
A: If this discharge is natural without lust etc. then she does not need to take ghusl.
If it is pure yellow then she will see whether this falls within the days of her haidh. If it falls within then it will be counted as haidh and the laws of haidh will apply.
And Allah Ta’ala (الله تعالى) knows best.