Is the saying, "I will complain about you to the Prophet," permissible?

Complaints should be directed to Allah Almighty alone, or to a living person present who is capable of addressing them. It is not permissible to complain to the Prophet, peace be upon him, after his death. Believing that he hears complaints or aids the one who complains is a form of major shirk (polytheism). Allah has clarified that worship is His right alone, and supplication (dua') is worship. Whoever supplicates to other than Allah has committed shirk, as Allah Almighty says: ﴿And I did not create the jinn and mankind except to worship Me.﴾

As for the phrase "I will complain about you to the Prophet if you do not send blessings upon him," it is incorrect for two reasons: 1. It brings about suspicion towards the person who says it, and the belief that they are supplicating to other than Allah or that they believe the Prophet, peace be upon him, hears supplications. 2. It obliges people to something that is not religiously obligatory upon them. It is not a religious obligation to send blessings upon the Prophet, peace be upon him, when reading someone's words. Rather, what is legislated is to increase in sending blessings upon him when he is mentioned.

The woman should be advised and guided to gentleness and kindness in inviting people to send blessings upon the Prophet, peace be upon him, and to explain its virtues without obliging what the Sharia has not made obligatory.