Can a nine month old Lab/Chow mix pup be corrected from biting and chewing?

We have a very nice, nine month old, spayed, Lab/Chow mix, that we have had since she was just a few weeks old, but lately she has become a little nippy towards our 7 year old granddaughter, and for no apparent reason.. Rachel, the granddaughter, just loves Winnie, the dog and the dog seems to love her, most of... show more We have a very nice, nine month old, spayed, Lab/Chow mix, that we have had since she was just a few weeks old, but lately she has become a little nippy towards our 7 year old granddaughter, and for no apparent reason.. Rachel, the granddaughter, just loves Winnie, the dog and the dog seems to love her, most of the time, to the point of getting very excited when she knows Rachel will be getting off the bus. Is there anything we can do to correct this behavior?
Also she seems to be constantly chewing on things that we would prefer that she didn't, even though we provide her with many, many chew toys. Will she ever outgrow this behavior?
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