"Should I reach out and begrudgingly TEXT her, explaining why I haven’t answered her messages since I learned what she had said to our mother while drunk again?"

I haven’t talked to my overly drinking sister for a few years now. She previously ruined a family Thanksgiving with a different drunk outburst and also squandered some money I gave her for a car. I want to confront her,

My father died from suicide in 2021. My sister, initially supportive, later drunk-dialed my mother and said a bunch of nasty things about both me and my mother. For some reason, my mother didn’t cut the conversation short and later told me what my sister said,