Bitter, envious lady. You had taken her son away from her and instead of rejoicing for him...she had to punish for "Desertion".
I currently know someone who's Dad has dementia and he had to put his Dad in a home, no one else would. Mother is bitter, "everyone has deserted me". But she had put her son in a strict boarding school at the age of 6
No insight.
So sad, envy instead of gratitude, and he's copping for it now, having lost all through illness and staying there, she berates him.
I suggested he get out: he has a dear wealthy friend I'm sure would help out for a bit with a flat while things are sorted.
Warning to us grans - choose love not hate.