Lavender6554,

Half a day's sun probably isn't enough to get a passie to bloom indoors; if you don't have a spot with more hours of sun, consider adding a plant light or two in the morning to supplement the sunlight.

Dropping all leaves is a response to shock; I can't tell the cause from your description. I'd gently ease the plant out of its pot and look at the roots. If they're brown and mushy, they've rotted from too much water; cut back the mushy parts, repot with some fresh mix and cross your fingers. If the roots are white and plump, it should be ok and put out new shoots and leaves.

Good luck!

Jim