It's a Sesbania. Could be grandiflora or formosa. Formosa tends to be only white or cream flowered, but grandiflora can be white, pink and even red. They grow into small trees. There are smaller species of Sesbania around that stay more of a shrub size but the ones I've seen don't tend to have flowers that large.

Thank you! Now that I have a name, the pictures online seem to match up. This is a beautiful plant. Hopefully I can get some seeds from her and grow my own.

pretty plant, and I LOVE that pot!

Yeah, she has a knack for finding some really cute pots at thrift shops.

The flowers are edible. In vietnam we stir fry them or put them in hot pot. Yum!