For that she needs to start playing some doubles tournaments to improve her overall net play...not to much tough
I don't know, probably, but I think it's a bad idea to play doubles right now at Wimbledon , it's to much. Dulgheru used to play singles, doubles and mixed at the same time and look what happened to her.
a) a fun thing to do for your casual ATP/WTA player pairing up with a friend
b) a way to gain some money
c) a resort for tennis players whose footwork or fitness suck too much for a singles career, but still can compete for slams and stuff as doubles specialists
The best players in singles usually don't play doubles to save energy.