You'll know if she's part Chessie once her fur gets a little more developed from the puppy fur. The white patch on the chest is also a good indicator but I think labs can sometimes have that too. I think a lab Chessie mix will make an awesome dog! But if she does have some Chessie your basic training might needs some tweaking and patience. They can be stubborn at times and while they want to please their owners, it just takes some patience and consistency to make sure they're doing what you want them to do.
Chessies and their owners are known to be fairly awesome TOO so congrats on that!!