Nice lady so far...why quit just before the finish line?

Any roots coming out of the bottom? How long has it been in the same pot? (rootbound?)
Do you let it dry between waterings? If not, mold or algae will likely develop.
Air circulation helps, too. Do you keep a fan on her?

Filling out the Troubleshooting Form would help to come to a more accurate diagnosis.
Run-off water comes-out murky, then as particulate matter settles, clears up.
Soil ph probes are unreliable. Milwaukee makes a good cheap ph pen, but there's others out there. Whether you use a ph pen, or an aquarium ph test kit...at the very least you need to know the ph of your water going in.