What is the ruling of wudhu before ghusl hayd? Is it compulsory or we can avoid it?

What is a female supposed to do if she finds a little sign of mascara after ghusl ( could be like minute) when she rubs the eye? The ghusl taken before becomes void or its ok to disregard it?

1- It is recommended, not obligatory.
2- If it is waterproof (prevents water from reaching the skin), then you need to clean it, wash the area where it was, with the intention of ghusl, then wash the rest of the body, with the same intention.