Well, kind of.
A few days ago, I had a clear-out and bagged up two black bags full of my old clothes/scarves/bags. Most were decent items and there were a few not-so-good items (still very sellable) such as trackie tops/plain t-shirts/jeggings.
My mother turned up and saw the bags and said "Ooh, what are you throwing out?" I said "I'm not throwing anything out, I'm giving some stuff to the charity shop." Then, without asking, she said "I'll have a look through and see if there's anything Margaret (name changed) would like." I stood open-mouthed as she rifled through the bags for Margaret, took all the good stuff out, put the less-good stuff back in and announced that she would take them for Margaret.
I said "Margaret isn't going to wear any of that, you're just taking it because it's free." She said that Margaret would wear them and in any case, Margaet didn't have many clothes. 
So I let her have them. Then I found an extra dress (a fringed '20s style dress that I bought for a themed party!) and shoved that in too. Mother saw and when I went into the kitchen, she took it out, inspected it, and threw it onto Margaret's pile. I said that I'd seen her and to put it back. I said "Now I KNOW you're taking stuff for the hell of it! Where is Margaret going to wear that?!" She did a sad face and put it back.
I feel pissed off about it but I don't know if AIBU on the basis that Margaret, who apparently has very little clothes, has had them and that I was getting rid of them anyway.
AIBU?