When people look at Siberian Huskies, they often comment "geez they must cost alot to feed/must eat alot etc" It's not true, Siberians actually require alot less food than other breeds of equal size. They have a very effcient metabolism.
When feeding a Siberian, look at the recomended feeding portion and halve it, and you may be somewhere in the right feeding portion.
To give you an example, I have a 6 year desexed Siberian bitch, very much like the one described in that she's a lazy little bugger. She can and will exercise, but would be much happier laying around, or perhaps going on a leisurely stroll. This dog gets 1/2 cup of Advance adult, plus a small handfull of mince per day. To bulk it up at times i will add frozen beans which she loves. Doesn't sound like alot does it - but i tell you, she's not the skinniest dog in the world thats for sure!!! This bitch would probably be around 22kg.
I don't know much about BARF so i can't comment on that diet, however at least halve the meals, and if she's starving you can bulk the meals with some veggies, or a fav of a friend of mine who has worked miracles on fat dogs...add some chicken or vegie soup hehehe...