I feel like there's a better item than Athene's for you to be spending the gold on, too. Keep an eye on power chord so you can do the aa-Q-aa thing every time it's up. Imagine if you had eat both those biscuits ten seconds before going in; you'd be at higher health, and you'd have another mana because you'd have gotten some from the biscuits and you wouldn't have had to use your w five seconds ago. Sona lives and dies on the strength of her Q and her positioning; your W is more effective later on because of its teamfight strength, but you need to be using your Qs way more effectively early if you want to help your ADC win lane. Sona can really get a lot of mileage out of the Knife item line, you want to be maximizing the value of those stacks. In team fights your main duty is to stay alive and put out the correct aura the Green power chord is really good btw, it's pretty much a mini exhaust if you can get it on their ap or ad carry that's huge. Play more safely against those kind of lanes and wait for the teamfight phase of the game.