rotties should be about 120-175 i believe....emotionally they mature around 1.5 years and physically they mature around 2-2.5 years....
thats what my vet told me...thats for a male on weight however, it may be smaller for females.
shes definately a cute one though...i wouldnt worry about her being small, the fact that she has the black/brown combo will intimidate anyone it needs to..