DD is 12 and very into all of the above. I've considered a Raspberry Pi but think she would get more out of something with moving parts and a bit more visible/instant results just now. It's on the shortlist for her 13th birthday in spring though.
I'm looking at some electronics kits, mostly the John Adams Hot Wires. But thought I'd appeal to MN for ideas I might be missing or don't know about!
Budget up to £50 but preferably more like £30.
TIA 