she is fine, but as a LeBlanc main (cough 280k points) I would agree that she could need some smaller changes. Her kit is nice and synergizes well. Her playstyle is good. The only problem - more than her lvl 2, which can be denied by staying back - to me is her q+r combo which makes just too much damage for being a targeted spell. My idea (I talked about it several times on the boards) was to shift damage to the second proc, so the player has to q+r+e even in the lategame for a successull kill. As a reward the overall scaling of this combo could be increased, so her lategame is not as bad as now.
You could ask your friend how he likes this idea