Well, I don't know the answer to my question but I'll comment anyway. If you lost your mom, I'm very sorry. My mom lost her mom back in '77 and says you never get over it.

I lost a bit of my mom when my dad passed on so I feel a big loss even though I still have her.
If you all are just not speaking and the whole idea of Mother's day is painful, I am still sorry and hope that somehow, some way, the relationship might get better. As long as one is still alive there is always some kind of hope. If there's alzheimer's or dementia involved, that is tragic too. There must be some type of hope that deep down in that brain/memory there is some connection that might not come out verbally or whatever.
Whatever the reason for your heartache, I hope the day is better than you think.
I'm a believer in "adopting" others in our lives to celebrate. While I'll miss my dad every single day and esp. on Father's day, I choose to celebrate another man who is a *type of father* in my life. Not a replacement--just someone to celebrate.