What is the ruling on supplicating against a domestic worker that she may leave without causing harm to the household, and is this considered an injustice to her?

If harm from the maid is feared, it is permissible to supplicate for her removal or for protection from her evil. Seeking refuge from evil is legislated. If the fear is based on reality or strong presumption, then one should continue to advise the father to remove her, while ensuring that the brothers do not mix with her or have private time with any of them. It is obligatory to adhere to Islamic guidelines when recruiting maids due to the corruptions that may result from it.