Lifestyle of this particular undead immortal monster: sleep for years in the sweet embrace of the crypt, wake up when a grave robber or archaeologist swings by, if he seems like a decent guy date him or marry him (whatever works out best; she has all the time in the world), enjoy the current trends and comforts of the time period, return to the crypt when the relationship ends. Repeat as necessary like she has for the last few thousand years, using the money she gets from life insurance and wills to keep her pyramid stocked with treasure to attract more grave robbers :D