Rose has a strider [the brand not the raleigh strider)
It’s brilliant – lighter and lower seat than the other 12″ ones, and just seems really well designed – things like perfectly sized grips, good stepover so it is easy for her to pick up, and a special child friendly brake that she is just starting to understand at 2 and a half.
Small enough that she was standing over it at 18 months, although she only got into it at about 21 months, was riding fine by 22 months, nowadays she rides to and from childminders on it, and is good for a couple of miles riding on a good day (and loves the bmx track!).
Oh and it comes in lots of colours and you can get a bar bag for putting important stuff (sticks and pine cones at the moment, but sometimes small bears and ambulances)