It's really hard to say how someone did; even detailed match history says very little about the match. Though with how it sounds from what you said, I wouldn't sweat this match, with the lag and everything else it didn't sound winnable in the first place.
I do have instructions tips for you.
- You were actually correct in getting the warding trinket first. It would just be good to get in the habit of switching it out when you get sightstone.
- You should level Q first, not W. Sona has strength in her early poke, get it to lend more damage to early game trading then level W at level 2 to heal your partner's damage from these early trades.
- Fix that mastery page. You have put too many points into tier one skills when they could be much better used on the better masteries higher up. Example: The two points in Recovery are wasted if you have three in Meditation like you do. Take them out and put one into Strength of Spirit and the other elsewhere.
Your Support and Cookies page (Love the name) is an example of
you doing it right for Sona. ; )