As the title says how would someone who is immortal, and driven by collecting vast sums of money be able to exploit that to their own gain.
For context my main character was involved in experiments in the 1950s to produce even more powerful atomic weapons and power sources, when an incident with highly unstable handwavium caused her to become immortal, but not invincible she can still be injured, maimed etc but what would be fatal injuries to a normal human simply put her in a coma for several months while her body recovers. She no longer ages or gets sick, but the limits of this regeneration are untested and she has no intention of pushing them. Many labs around the world have attempted to reproduce this incident unsuccessfully, only leading only to the agonising deaths of the test subjects. So selling the ability to others is off the table. I've not yet decided whether she is open or reserved about this ability so suggestions on either side.