Answer: Your 'China Doll' is a Radermachera sinica. It likes 2-3 hours of curtain-filterd light a day, evenly moist soil, 60F to 70F temperatures and the leaves tend to drop if the soil dries out between waterings. So, your nurseryman was right about the constant soil moisture, but wrong about the light. Move it to a bright spot, out of direct light unless filtered and hopefully it'll grow back.
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