Hamster weight

Question
Hi , I have a dwarf hamster that was given to me in early summer by someone that felt she couldn't care for it any more. It was just young when I got it, I'm guessing around 12 weeks. She was tiny but bright eyes, energy plus, beautiful black coat with white chin, feet and tail. Just to give you an idea, a small "silent spinner" wheel is plenty big for her. She has always been small, may be she was the runt or something. Recently I read that a dwarf hamster should weigh over 40 grams and she weighs in at 28!! She eats a block type diet with a few seeds mixed for variety. I also give her hay, oatmeal flakes, and fresh veg each day. Sometimes I give her a bit of millet as well. Her water (water has vitamins) consumption is very little (normal)and she looks and acts healthy as a horse. I weighed her once before and she was 29 grams. Is there any change I can make to her diet to increase her calories...or is she just little?  I don't know what kind of dwarf she is...but I'm thinking Cambell, although her fur is a little longer than my other one, and it is very shiney with a stripe down her spine. I also have a second dwarf (separate cage) and he weighs 55 grams! He is noticably bigger than her. I never give them anything with sugar. I would appreciate your incite...I do have a wonderful rodent vet, but I don't believe she's sick...no lumps or bumps...just tiny!! Have you ever had a tiny ham??Thanks for your time.
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Answer
I have actually had a tiny hamster like that.  She never went above 24g her entire life.  In fact when I first got her I believed she was a baby.  She did have some other health issues later in life but I don't believe it had anything to do with her size, more likely her breeding.  By the time she was 9 months old she was completely blind, one eye was missing, the other had a cataract and glaucoma, and she lost most of her fur due to a metabolic disorder.  Even though she looked a bit odd she got around just fine and was a normal hamster.

The other thing I've noticed in dwarfs is that the females are quite a bit smaller than the males.  My males have always been in the 40-60g range where as my females are generally around 30g.  The 2 females I have here now are both 30g currently, where as the last male I had was around 46g.

You can feed her higher protein foods if she appears to be overly thin, things like cooked chicken with no spices or a bit of tofu, but she sounds like she's a pretty normal weight for a female Campbells.