Hi -
Welcome.
James Wellbeloved is one of the better brands you can get in the UK, I haven't tried it, but after trying Orijen and finding that Belle was perhaps finding it too rich, I will be trying JW and mixing this with the Orijen, too.
My mother-in-laws pup is about your size and she is feeding about 50-60 g a day plus some treats and a little meat. You could also try (if you have no other animals) free-feeding so that your little girl can help herself when she wants.
Good luck
