Once she's tame you can cut them back a bit
Have you tried pumpkin seeds? Maybe you could alternate them if she likes those too.
With regard to her food mix, I would change it (gradually) to something better and more specific to dwarf hamsters. The Pets at home mix isn't very good quality really.
A good option is Burgess Dwarf hamster mix, which is also sugar free and has some mealworms in, plus good ingredients. Dwarf hamsters can be prone to diabetes so a sugar free mix is a good idea. That mix is dwarf hamster specific too so the pieces are a good size for them
http://www.petsathome.com/webapp/wcs...E&gclsrc=aw.ds
I think you can get it on Amazon as well. When changing a food mix it needs to be done gradually or it can upset their stomachs. So start by adding a little bit of the new mix to the old. Empty and refill the food bowl each day, discarding any food in it, then each day add a bit more the of the new and a bit more of the old, till it's about 50/50. Leave it at 50/50 for a few days maybe, then gradually reduce the old so there is a bigger proportion of the new. Over about two weeks.
They often leave quite a bit of food in their bowls, so it's important to empty the bowl each day and refill it, while you're doing the change over. After that,maybe just discard any food not eaten every 3 days or so and put new in.