Seriously overstepping boundaries.
Maybe you should do a prank bag of "goodwill" and buy a vibrator to put in the bag. It will cure the nosey.
My MIL rocks. She does occasionally give the boys cheapo toys that she finds for next to nothing, but she tells me upfront they'll enjoy them for a day then I can quietly ditch them after they lose interest For us grown ups, she buys very nice gifts so I have never experienced having to donate or otherwise get rid of things she has given us. She has very much come on board with the no plasticrap battery op toys though.. and she tries to not buy mic items either. Actually, 9/10 things she buys come from my favourite kids product store so I know they are quality as well as not made with toxic materials GO MIL!
OP, I'd have just given her that look right back.. along with the silly xmas candle holder & easter egg thing You would think after being married to their family members for a few years they would clue in a LITTLE to what kind of person you are and what you might like?