Supports out damaging assasins

So I just had a game of aram where a Sona building support was out damaging me as Leblanc by just casting q for about 600 damage where as mine only did 400 damage and made my w do 600 if I followed up with it... she could then auto attack thanks to her passive from it to do 500 damage for some unknow reason and ult to get a double kill dishing out over 2.5k damage in as much time as leblanc building AP is bursting out maybe 1.6k damage. How the fuck is that even balanced in ANY way?
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