My mother's condition is being treated. It hasn't been cured yet.
Ditto. My mother is undergoing treatment. It will not be clear for several months whether or not what the medical team term a "cure" has been achieved.
Going back to your previous question, "to treat" is different from "to cure", yes. You can cure something in the long-term by treating it. The headache example was a good one. We treat headaches with painkillers - aspirin, paracetamol, ibuprofen etc. But having a headache isn't a disease or even really an illness. It might become one if you have a permanent headache or if you suffer, for example, from severe debilitating migraines a couple of times a month or more. In that situation, if someone found a drug which stopped those migraines from ever coming back, you might say "They've finally found a cure for my migraines". If you have a normal everyday headache and you take a couple of aspirin, you don't refer to it with "Wow! I have cured my headache!"
We generally cure the kind of long-term, chronic illnesses/diseases that people suffer from. For normal day-to-day ailments, we treat them.