@jim When I went to the sports injury clinic it was at the time that all these folding ballerina shoes that you could stick in your handbag, were coming into fashion and the chap who was a specialist said he would expect to see many girls coming in due to this footwear causing PF. He also said it was the lack of heel and walking barefoot on hard surfaces like lino and short carpet that contributed significantly to the heel pain which is what a lot of the websites also agree with. Also excessive pronation (feet rolling inwards) which mine do. I wore some very ‘old lady’ type sandals that my mum wore (probably another generalization there lol) and they had a cushioned heel and made a huge difference.
It took about 14 months for mine to go away completely.