My advice is since it is going to eventually be "your" room don't let her pick anything. My wife "helped" me pick a table and she hasn't played on it after the first month and that was 35 years ago.
Being on the first floor and the pool trend today I would recommend a 9 ft Diamond with tournament blue if you don't have the room go with the 7 ft Diamond. The cloth on the table doesn't have to match anything. If nothing else get a cover to match what ever she wants it to match. That way when she walks by and no one is playing she will be happy. No one playing pool will care or notice if the cloth matches anything. It is a game room. Look at any casino or pool hall and the colors are all over the place.
Get the Diamond with tournament blue, paint the walls off white, do whatever you like on the floor, fill the walls with all of your sport stuff, and then make sure there isn't a window or mirror behind the foot spot.
Other than the garage this is the only room you will have any input so do it the way you want. If she doesn't like it she doesn't have to use it.
Also don't understand how it is easier to "decorate" around dark green?