I think that getting worse means that the disease itself, was causing the degeneration, not the medicine or therapy. It could be stated as 'she kept getting worse'. As would be expected from certain ailments if they are not treated correctly, or not treated at all. Many people die today, with modern day expertise and technologies. Chemo sometimes makes people worse, or offers very little remedial assistance, and can go on for a long time.
How long does it take for a doctor to determine that something is incurable, the same amount of time that the victim should realize that their efforts , and her hopes, are in vain. And thus, should've stopped subscribing to their therapy. Clearly, both parties are either complicit in squandering the money, or there was more going on than was told. The latter is correct, as neither Gospel writer was trying to incriminate or disparage the doctors.