Thanks Yaowen. She is a terrible bully. I texted her just now to ask her to call me so that we can discuss our communication boundaries with each other around our mother's care.

If she calls me, I will just focus on the facts - the content of her text messages - and assert my boundaries that way.

Advice articles would argue that requesting communication from a narcissist/bully is futile (and my text request is, I think). So, I will be surprised if she calls me.

Right now she is stonewalling me i.e. no phone call or text response to my request. Aka the silent treatment.