Is it forbidden for a wife not to tell her husband what is on her mind about their marital relationship if shyness is the impediment?

The wife has rights over her husband, and if the husband falls short in these rights, she has the right to demand them from him. Abu Sufyan's wife complained about her husband to the Prophet, peace and blessings be upon him. Similarly, the wife of Umar ibn al-Khattab complained about her husband, who would fast during the day and pray at night. Ka'b ibn Sur al-Asadi ruled that the wife has a right over her husband regarding spending the night, for four days and nights: she has one day and one night, and the husband has three days. Both spouses should know that honesty and dialogue are essential for the continuation of marital life.