J.M.
I think this is normal - as in lots of kids do this. That doesn't mean that all kids do it or that it's acceptable. My daughter is just naturally a good sharer and pretty much skipped this stage (and I of course patted myself on the back) but my son (who's now a little over two) is just a much more aggressive kid and, even though he's the younger one, has a much harder time sharing. Even though it's going to feel like you're not getting through, don't ever let her "get away" with this behavior. Time ours are good, so is taking the stolen toy out of her hands and returning it to the original owner. I agree with the previous poster that it's pretty irritating as a parent to let another kid walk all over yours, so even if it doesn't immediately address your daughter's behavior, at least it will be letting the other parent know that you're trying. And you might have a year (or more) of this behavior - she's not going to get that other people have feelings for a couple more years yet. But it won't be forever. Good luck.