I have lots of allergies and don't garden or have many plants.
Notice the two very wrinkled looking leaves that fell off. I looked up
how to care for this plant and it says this is over-watering but I am
watering it so little, I can't believe that is the cause. Any suggestions
on what I am doing wrong?

This plant has lots of sentimental value to me. My sister (Cindy, the one
with cancer) and I bought this plant for my Mom back in the mid 70s when she
was in the hospital after a bad accident. My Mom has kept this plant healthy
all these years until last Jan. she had to give up her house and move into
a very small senior apartment. She had to give up her beloved houseplants
due to space issues. I took this one because it symbolized my Mother surviving
her accident.