Answer: Crape Myrtle trees are attractive and will hold up under the conditions you describe. Other suggestions include Chitalpa, Crataegus, Lagerstroemia or Acacia. I've trained Callistemon (bottlebrush) into a single trunk, removed the lower branches, and ended up with an attractive flowering tree in my landscape. Your mom could do the same!
Hope one of the above trees fits perfectly in your mom's landscape!
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