Waller picking Nina for the Commandoes

She looks like a monster but she's a timid, kind girl without a violent bone in her body. Waller is a lot of things, but stupid enough to use Nina as an assassin or bodyguard? "You should see her in the water" is such a stupid comment when it's a land-based mission where your agent is one cracked piece of glass away from dying at all times. I know she's disposable, but useful? Amongst the rest of the monster crew?