Exactly. Fully agree. I've seen many estrangements like this and the parent(s) always play down their role, making it sound as if their child just went no contact with them out of a blue sky, on a whim, for no reason whatsoever. Usually followed 'I was a hard-working, good mum/dad, I gave them everything'.
And they often like to manipulate their offspring using inheritance (if there is any), dangling it like a carrot.
My grandmother is like that. No one can stand her, not her daughter (my mum), not her grandchildren. We're all very low contact. A manipulative, martyr-ish, 'woe is me' narc. Forever writing and rewriting her will, dividing and re-dividing her riches, attempting to pit us against each other based on what and how much she'll (theoretically) leave us. No one cares, and she can shove her money up her old arse.
Yet if you'd ask her, she's just a poor woman, who devoted her whole life to her daughter and grandchildren, wanted nothing but the best for us, loved us unconditionally, yadda yadda. And we're ungrateful evil cunts who never visit. All her granny friends believe her poor, defenceless lil granny shtick and think us Antichrist. Nothing could be further from the truth.
I absolutely don't believe the 'poor me, evil son' act. However, the money is legally OP's and she's perfectly entitled to keep it all, if she so wishes.