i own a weimaraner who is 9 months old she is alot darker than any other weimaraner i have seen is this common and will she get ligther

unfortuanely your pup may not lighter in colour, some of the silver grey colour is becoming hard to find in some breeding lines. although some breeder are striving to keep the desirable colour of the silver grey. Out of intested how is your puppy bred? as this may give an indication.
regards Rachel