I enjoy my future in laws (we even lived with them temporarily and I still like them!) but my future MIL has started buying things for our wedding and gets super offended when we say no thank you. We are having a classic (and super simple) wedding and already have most things picked out. I know she's trying to help but it's getting tough when she is buying things left and right and doesn't ask us first. She said she can always return it if we don't like it but then she'll do something to make it so we can't return it (she bought a small truck with a pumpkin in the back and hot glued our pictures in the inside so it looks like we're driving it). She is also having her friends pick things up and they are getting really mad when we don't like or don't want to use what they get us.
Is there a nice way to say stop? Or do we just accept this crap (some of it is really tacky) and "lose" it prior to the wedding?