Freeze . . . it's the culture of the religion that adds to this . . .
As you know, JW's are constantly getting the message they're not doing enough . . . not good enough in other words. It's a religion that uses the guilt imposed by that sense of failure to beat the R&F with. Your Mum is probably still being subjected to that after many years of it already. It's likely she will see you through those same tinted spectacles . . . but you've ditched them which lowers the perspective even more.
And of course you still bare the scars of that yourself. It's as much a product of this constant put down, as it is her personal feelings . . . more so probably.