Strictly she is. She’s certainly not a combatant. If the factory is operated by the military using military people and she was one of those military people then she would not be a civilian.
This is all tied in with the very slippery slope about combatants, direct support, indirect support, and the “civilian economy” in the context of modern industrial warfare where the whole economy and whole populace is supporting to various degrees their nations’ war efforts.
Once you’re shooting at somebody who’s not actively shooting at you at that moment, how close to “combatant” is close enough? Darn hard to know.