My dad's mum was just like this. Hated women so when dad and mum got married she refused to have anything to do with them. When my elder bro was born, she reconciled herself to the family, adored my bro.
At some point after this reconciliation, she threw a paddy about something and cut us all out again.
When my little bro was born she was reconciled to us again. She died when I was 10. Every time she cut us out, she rewrote her will, and in the end everything went to the woman next door to her with whom she'd had a row years before and hadn't spoken to since ([wry grin]).
The most poignant thing was when dad found a bag containing all the letters he had written 'home' since he was a small boy (dumped in boarding school at age 5, and never went home even for the holidays). He thought that she had kept all his letters, everything he'd written to her from age 5 at school, to those he'd written from Vienna before the war, to those he'd written during the war, he thought it was an indication that she had cared about him, really.
Then he found that NOT ONE of them had been opened. NOT ONE.
You are better off without her really, but it's down to your oh. Seeing the gp is a good idea, but it's quite possible that she's just a spiteful hatefilled old cow like my gran.