FG% is not a measure of scoring efficiency. It doesn't take into consideration that 3-pointers are worth more than twos, and it doesn't take into consideration what a player does at the free throw line. For her career, Jones is averaging 11.4 points on 10.6 field goal attempts plus 2.2 free throw attempts. That is the very definition of volume scoring. Charles, for her career, averages 17.2 points on 15 FGA and 4.1 FTA, so she is almost using a possession for every point she scores. And note that both have done worse than that in the playoffs.
Catchings averages 1.4 3PM per game, gets to the line 5.6 times and converts at 84 percent. That makes a difference. Is she efficient as Diana Taurasi as a scorer? No, but she's more than acceptable.
If you really want to see how efficient a player is as a scorer, try using True Shooting Percentage (TS%) or effective Field Goal Percentage (eFG%).