Believe it or not, she's over 90 and I did talk to her lmaoKeeping her corruption down takes effort, for sure. I do daily sorties in portals, sometimes two, and rush to hives and get out after. In my last 60-day run, her corruption got to 14 early game because it's challenge 5 and i need a bit of setup, but then i keep it <5 no problem ("first meeting" mission playing as Evolution can get you a nice -10 if you talk to her instead of ambushing, and talk instead of attacking Hebi after the fight). Druid really has to suck it up and cull the portals, though.
Cycling between 3 stable portals is enough for me to cull the hives regularly, with the map explored and a few teleport points the stamina drain is minimal and i can still explore new portals without problem. Getting 2 fighting teams might be worth it if you really want to go on a hive-destroying rampage.
Does destroying a hive remove more corruption that it gives? If every portal is generating hives, if you're only clearing out three of them, how does that actually keep the corruption down? Shouldn't you need to clear every portal to prevent it from increasing?