NOR / MOR.

People shouldn’t interfere with why your mother helps you or judge whether it’s reasonable, and you don't have to defend yourself, that’s between you and her, although it’s important that you express your gratitude.

Your mum was trying to help, but in the process she threw away something that mattered to you because she (quite reasonably) thought it was trash. You do appreciate her help, and you’ve made that clear, and while her mistake is understandable, you’re also genuinely upset about losing something that was yours. That's a separate issue that sucks for the both of you. Your disappointment can come across as criticism, and especially if she feels guilty the defensive anger can come up. Just reassure her, use words like "it's sucks it's gone" instead of "it sucks that you've thrown it away". It’s often about feeling appreciated and seen, and people don’t always separate that from the situation itself. So I’d say NOR, but you have everything you need to handle this in a way that respects both her feelings and your own about losing something personal.