
Hi
Huskies are notorious for being picky eaters and this is a common problem particularly in young siberians. Normally I'd recommend she keeps her on the food she's used to for a few weeks at least until she's settled in. However if the food she's on really isn't suiting her then I'd change over now but do so gradually over 5 days or so to avoid an upset stomach.
I don't know nature diet myself so can't really recommend it or not, but I think quite a few people on here feed it. Any good quality complete food or BARF diet will be fine, but it's usually a case of finding one that suits and then sticking to it. We feed ours Arden Grange Lamb and Rice which I'd recommend and a lot of husky owners feed it. It also contains probiotics which I find helps their appetite and digestion a lot. There are lots of other good brands though, but avoid any cheaper supermarket own brands etc.
Huskies do tend to eat less than other breeds for their size so she may be overfeeding. I'd try putting a smaller amount down, twice a day and leave down for 15 mins or so and if she doesn't eat it, remove until the next meal time. Once she's eating normally then increase the amount very gradually until you find the right amount for her. The best thing is not to pander to them as if you keep offering different things they will just hold out for something more tasty. Increasing her level of exercise might help increase her appetite as well. It might be worth cutting out treats for a while or just giving kibble as a treat.
Providing she's happy in herself then it's best not to worry about it too much (although that's easier said than done).