First single speed project - help!

Her existing bike is quite horrible. Its brakes scare the shit out of me and it weighs a ton. But even then I think it might just beat Decathlon. Thanks though, I am surprised how cheap that is.

At the stupidly cheap end of the market, the Decathlon b'Twin Vitamin for £70 !

It's not exactly the best single-speed in the world, but it's pretty good value for money. The gearing is daft at 52", the supplied lights are laughable, and are best chucked straight in the bin, and the frames a bit on the heavy side.

The brakes are a bit cheap, but they seem to work OK, likewise most of the components, which are noname unbranded stuff, but for that sort of money it's fine as a cheap, pub bike and similar.

It only comes in two sizes, Medium and Large. The Medium may be OK for someone 5'6", but you'd have to try it out.

Of course, her existing bike may well be better than this...