Is there sin in concealing the news of the death of a Muslim maid's husband from her, at the request of her father, due to fear of her traveling and difficulty returning, given that the death occurred six months ago?

If a husband dies, his wife must observe the 'iddah (waiting period), and she must be informed of his death. However, since six months have passed since her husband's death, she is not required to observe the 'iddah unless she is pregnant and has not yet given birth. It is more appropriate not to inform her of her husband's death at this time, due to her father's request and the potential harms that might result from informing her.