Is giving away stuff you don't use rude?

I have this really cool flower lamp that I’ve had since I was a little girl. I never use it, but I remember when I was little I wanted it for the longest time. I was cleaning out my room today when I thought I’d offer it to the 3 year old that I babysit. I thought maybe she would think it’s cool. So I texted her mom and offered it. I told my mom about offering it and she kind of scolded me saying “they don’t want your junk!” Now I feel kind of guilty for even offering it to that 3 year old. Her mother hasn’t texted back so maybe she’s offended that I’d offer her my “junk”. I had no intentions of being rude, I just remembered how cool I thought it was when I was little, so I thought I’d offer before I threw it out.

What are your opinions on people offering you stuff they don’t use?