I don't think of Karich as a particularly physical player (though she is constantly on yellow watch due to tactical fouls). She more excels at positioning and control. So, it might not be a great fit tactics wise if that is what is needed. However, with her awareness and game sense, I think she would probably be able to fit into other systems pretty well, though I haven't had the chance to see her play on any team other than Boston.
I think she might be very likely to be in the conversation were something like an injury happen to existing roster members. I think she has the quality to represent well on the international stage.