If VENUS is fixed to her rotation axis(as seen from above) during one solar orbit she will appear to make one revolution as seen from the sun.
Agreed. With the theory of tidal locking assumed, when Venus retrogrades to the point of non-rotation, it will appear to rotate once per orbit as observed from the sun.
When it continues to one pro grade rotation only one side of Venus will be visible from the sun.
If Venus continues to two pro grade rotations, it will appear to rotate once per orbit as observed from the sun, the same as a non-rotating Venus.
How do you distinguish between a non rotating Venus and one rotating twice per orbit?
If she presents the same face to the sun for one orbit she will make one revolution as seen from above.
Agreed, but if rotation is fixed (axle is frozen), the appearance of rotation is an illusion.
An object with a fixed axis is rotating about the center of the orbit; not its axis. The axis can't be fixed and said to be rotating at the same time.
Another example is a horse on a merry-go-round. The horse is rotating about the center axle; not about the pole through its back. As seen from above, there is the illusion of rotation, when in reality we know the horse is not rotating about the pole.
Keep in mind that an axis can be imaginary or real. A real axis is an axle. Cosmic bodies have an imaginary axis.