Is it permissible for a woman to anoint her head with olive oil to treat a headache if it causes her difficulty in washing, especially in winter?

The aforementioned oil, being liquid, does not prevent water from reaching the skin. Jurists have stipulated that substances like it are not considered barriers. Therefore, there is no impediment to performing ablution (wudu') and ritual bathing (ghusl) while this oil is present, and its removal is not necessary.