Your China doll in a large kitchen window losing leaves despite good light and "proper" watering is exhibiting classic Radermachera drama. These plants drop foliage for any stress: light change, watering inconsistency, temperature shift, drafts, pests, aging, or repotting.
Consistency is the only "cure." Even then, they're temporary guests.
Straightening a Leaning China Doll Plant
Watering China Doll: The Finger Test for Your Unique Plant
Propagating China Doll (Radermachera sinica) from Stem Cuttings
Keeping a China Doll Plant Small Indoors
White Balls in China Doll Soil & Yellow Drainage Water
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