Hmm, question about Diana

Ok I admit that I completely tilted last game, but Diana felt like she was too op She started to one shot people with like a jungle item and like a tier 1 item (I dont recall what) I get that she probs have ap runes and my team had almost no MR, but it was kinda op... Then I remember her having about 110 - 120 ap, she one-shoted me without hitting the q (80 damage from stalker blade echo) and her ult (Then auto) She was 3/1 I think before she killed me. Then she got really fed and I got into tilt mode. zed support was going really well actually... I was 4/1 at one point. Then later in the game, I had ~132 mr and she one shotted me again (with Maw of Mal). I had the kindelgem also for some extra health, i get that I rushed to protect the tower and tried to kill her without ult (bad mistake), but she q-ed me and ult-ed me (probs w shield damage also). I definitely respect what kind of damage a semi-fed Diana can do but what do you guys think? These are her runes ( https://www.lol-mmr.com/profilev2.php?summoner=Gho57ayame&region=na )

P.S. for RITO sometimes Maw of Mal doesn't trigger... It doesn't go into cool-down if I get like bursted and die is the evidence. It only happened like once or twice but thought might be important for high elo players.

GG WP