Equaling the bite to the Shugoki's embrace might be a good point. If she misses she should take damage.
Not as much as the Shug of course, because he has more health and has the potential to one-shot just about everybody. Have her missed bites remove a bar of health, making it an extreme risk to try the second jump after the first has been dodged, but the first miss not too punishing.
I also think a gb after a missed bite should put the Shaman out of Stamina if she ia thrown, BUT that she should be able to cbg it.
I played with a buddy of mine last night who was a rep 10 shaman, after several matches of getting my butt handed to me I had him figured out and could beat him, but that's kind of the point of the game, learning how the opponent plays and adapting.
That said, the only changes I would make to Shaman is remove the guaranteed pounce after GB and throw, unless she manages to wall splat you with the throw. This could be done by delaying the startup of the pounce by a few hundred ms or by making the recovery for a non-wallsplat throw a little faster. The other change would be to increase the stamina cost of a whiffed pounce, seeing as she gets a full stamina restore if she lands it.
Looking at the other ideas on this thread however I'd like to add that I do not believe she should lose health on a whiffed pounce (bite). It's one of her tools and unlike Shugo it cannot one-shot kill. I also think it should not be only available on OOS opponents because that defeats the ability to punish it. If she can only bite a OOS person then she wont use it except then, but then the person who dodges it, being OOS cannot punish her.
Just my personal take on things, see you on the battlefield!