Nami ratios

Is it just me, or are Nami's AP ratios a bit much? Just watched her carry a teamfight with nearly two pentas (on aram, mind you) but she was getting quads with a frostfang. Maybe drop them a bit? I play her, but this seems a bit much. Plus thunderlords, she seems to put out a lot of damage seeing as how she is a support with just about everything in her kit. I feel like any one champion with this much utility shouldn't be able to put out that much dps. Thoughts?