Hi, and welcome to the board!!
IMHO, light quality and strength is probably the #1 most important factor in blooming catts. The leaves should be light green. Watering helps and is certainly important, but light is far and above more important. You could water forever (but don't!!) but without sufficient light, it will never bloom. Think a south or southwest window, that's how much light catts need.
Answer to question 2: "moderate light" means an east window, or a shaded south or southwest window. The thicker the leaves, the more sun the orchid can tolerate. I don't know about leptotes specifically, but perhaps someone can chime in with more cultural info. As a rule though, unless your frosted window is a south window with unobstructed light, it probably isn't enough to bloom the orchid again.
again!!