The humorous thing is that she was curling what the underdeveloped guys nearby were...I felt like telling them to put some 20s on their barbells and pick them up off the floor, but I think Leesh out-curling them a couple metres away was enough to make them reevaluate or at least assume she was on the gear...
We rarely do biceps in isolation. Pullups and deads (when she can do them) do most of the work for us. But while she's off the back stuff, it's not bad to keep things activated and isolation does do a small amount for growth even if it's limited by the rest of the body's muscle.
Focus right now is on increasing those pull-up numbers, keeping the squats out of back hurting territory, getting her bench up to 60kg and repairing the back so we can slowly reintroduce back rows and deads.
I do hope the pic above is an example of what I mean when I say a female's view on self image should often be taken with a grain of salt. There are teenage girls who would kill to look like that IMO.