She
-rarely died
-ubercharged more often than any other medic
-had more kill *assists* than any other medic (this is why her kill count is low; her medic kill assists were extremely high)
-knew exactly who was best to uber
--had the most building destructions as a medic
-was one of the best/helpful engies on the server (i.e. she didn't build her way to #1)
Ubercharges and kill assists were an enormous part of it. Back when we were frequenting eGO's servers, the ubercharge action statistic was something like this: all medics were within reasonable range of each other until her. Statistically, she had 3 times as many ubercharges as the person in 2nd place for that action. She also blew away everyone in medic kill assists (at high ranks these are worth more points than kills and normal kill assists) because she avoided death better than any other medic, kept the right people alive, and ubered the right people for a massive amount of kills/destruction points/dominations.
We're about as inactive as Huskies these days so I'm sure some have caught up to those action stats by now.