Older daughter estranged herself from me, again, a few days ago, as she does regularly,

[No Vested Interest]

10. Could you try to get past it by sending a valentine

to her son, your grandson?
No reason her son should suffer the loss of grandma's attentions because of mama's snit.

I know her words are hurtful; who can hurt us more than family members - those we care about most?
You've been through this many times before, so you know she'll come around -eventually - until the next time.

My two daughters, 13 months apart, are ying and yang - complete opposites personality-wise.
Always have been, since infancy.
They mostly get along in public, though "zingers" are periodically thrown out.
I mostly accept the situation and try to stay out of it.
I'm too old - and they are too- for me to try to be the intermediate - the peacemaker.

Sorry to know that you have this upset - again.