What is the ruling of Islamic law on boycotting the mother after she initiated the break with her daughter, despite the daughter's attempts to communicate?

By her actions, the questioner has committed two major sins: disobeying her mother (uquq al-umm) and severing ties of kinship (qati'at ar-rahim). Disobeying one's mother is among the most severe prohibitions, as evidenced by explicit texts that mandate honoring and maintaining ties with one's mother. It is incumbent upon the daughter to treat her mother gently, be kind to her, and patiently endure any harm she may cause.