All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.
The salary of this woman is lawful since it is earned from lawful work, which is, the treatment of patients. She does not earn this salary for being alone with male patients since this matter is accidental and does not represent the main basis upon which she receives the salary.
Allah knows best.