I agree with others here. This is not a QFF issue and like a ‘normal’ ticket rewards tickets comes with t’s and c’s, you just paid with points as opposed to cash, so I think you’re being treated very fairly as any airline would with a paying customer. If you had a bought a ‘normal’ ticket you’d be faced with exactly the same issue. Take responsibility for your own actions and don’t blame everyone else because you didn’t get what you wanted after you’d entered into a contract to buy a product. And unless I’ve misread, your mother is still getting home, I’m sorry this may distress her but you need to take responsibility.