There's absolutely no way I'd be advising friends or family to run a site vibe coded themself, that's nuts.

This is more a problem of your Mum mismanaging her contractors. She should be threatening hellfire down on this contractor for withholding the admin username + password.

Generating the site with Claude would be a pretty stupid choice for her right now, if she needs something more than a basic info site, word press is still king, but she should be able to do info updates herself.

OTOH, you might be able to ask Claude to do the changes for you.