If you want a bag and shoes that go together and that she can wear regularly try Dune or Moda in Pelle. They aren't cheap or expensive, like mid range (£50-£80 bag, (£75- £160 shoes). You can even try River Island/Topshop they have nice shoes. And All Saints have some good stuff but they aren't your everyday thing, they are a little bit out of the ordinary (I personally love their stuff)

But as said above if you are willing to spend a little bit more then there are some really good brands and designers to choose from, but you are prob better getting her shoes OR a bag. Miu Miu bags are gorgeous!

Oh and if you go for Radley make sure you get her a decent sized bag!! My bf bought me a Radley bag the first xmas we were together but he didn't wanna spend over £75 cos we hadn't been together long so I ended up with a dead small bag that I never really use!!!