He may not see her as his weakness but others in the secondary pack may try and think that would be the way to get him to back down. Little would they know that she can actually handle her own and is not afraid of doing some ass kicking herself. She does put her pack first before anything so she is always there for when her brother needs her. Which is why the whole Connor thing is still very much so a secret. Like she blames her still having some of his stuff for why she kinda smells like him and all that jazz.
And Charly knows that deep down but is still sad that she has one less brother and she is no longer allowed to be mated to the person she wants to be with.