Mother's Day advice?

So, for 1 year now, my mother and I haven't spoken. She got angry with me for saying how I and my daughter felt about a situation and in turn she stopped speaking to me. Now, not that I haven't tried or even tried to make it seem like she was angry with me...which made things very awkward...but none the less, I've stopped trying since October of last year. With Mother's day coming up, I was going to send her a text and tell her happy Mother's day. I dont expect a response back from her, (reason for texting is I love 2 states away and she WILL NOT answer a phone call from me) but part of me feels like why should I be the only one putting forth the effort if she got mad at me for how I felt about something. It wasn't anything bad per say. Feelings were unintentionally hurt for both of us and she took it to not speaking.

My question is, should I send the text anyway or just not bother. It hurts my feelings either way...she's my mom and I love her but her childishness is toxic.