Like Amity says, unless you have a pedigree to prove she is a pure-bred Winter White or Campbells, you must treat her diet as that of a Russian Hybrid.
Hybrids are prone to diabetes so you must try and limit her sugar intake. This involves not feeding too many sugary vegetables (like carrot) and giving fruit as an occasional treat. Never feed any treats with honey or added sugar in and stick to more natural treats like pumpkin or sunflower seeds. I have a pure-bred Winter White and he goes crazy for pumpkin and sunflower seeds. She may like a Whimzee/Greenies chew toy. These can be found in dog dental chew section of pet shops. Pets At Home stock both but only sell massive Whimzees. You can buy the teenie and petite Greenies at Pets At Home in packs or singularly. Other safe chews are Pedigree Milky Biscuits. These are all treats Larry-Jasper goes crazy for.
I would recommend the Burgess Dwarf food if you are able to get it. You should be able to find it online and in most Pets At Homes. It is perfect for smaller mouths and diabetes-prone hamsters like Hybrids.
Good luck with your Russian - they make excellent pets and are my favourite species of hamster
