Video noise and harsh shadows on green screen caused by feet
To reduce or eliminate the greenish reflection on the front of the table, you can buy some dark gray or black construction paper, or something equally non-reflective, cut it to size, and tape it over the 2 dark rectangles on the front of the table.

I have 3 different solutions for the foot-shadows on the floor.


You could point a semi-dim spotlight directly on that section of the green screen. Make sure to mask it so it doesn't hit the dark rectangles on the front of the table too much.
If the camera is always stationary, you could lower the camera slightly so the talent's feet never extend past the dark rectangle on the front of the table and into the green (as the tip of her left shoe does in the pictures you included). Then you can mask out that part of the shot instead of relying on the Keylight effect.
You could just move the camera about a foot closer to the talent so you crop out the bottom of the table (and the green in front of it). You can also do this by cropping the shot during post production.


(Or, obviously, just get shorter talent.)