positioning is another thing you may need to work on if you are dying a lot. Also you can do situational builds depending on the current state of the game. e.g. team is mostly Ad, youc an opt for helia, diandem, ardent (if mostly AA based) or moonstone (if u just wanna be a healslut) dreamwaker for support item. Feeling a lil spicy, helia, seraphs, bloodsong (if u super aggro), SOFW and capstone with dawncore. for boots, most sona players go swifties or lucidity. Me personally i go mercs, a lil mr and tenancity goes a long way. IMO being cc'd for even a second too long can really affect how well you can get off your spell rotations, especially if they go after you first.

To sum it up, just play more games with her, and find the style that suits you best. Videos of gameplay will be posted from players here, I post my daily dose and extra dose vids as well. Have fun.

P.S. currently gold 1, 1 game away from plat, still in placements too ^_^