Answer:
When the writer opened the main door of her house she witnessed Lady Cloud floating into the main house in her floating gossamer gown.
Step-by-step explanation:
In Ranikhet's gift the author describes a typical monsoon day of heavy rain in her village, detailing the sights and sounds she witnessed.
Upon opening the main door of her after the rain she "witnessed Lady cloud floating into the main house", Lady Cloud here means the hazy atmosphere that settles over the village after the rain, and which floated into the author's house when she opens the door.