Umm, don't think Vika is as ice-cold as Maria is off the court. Maria self-admittedly claims she has no friends on tour. Vika seems to follow tons of players on Twitter and Instagram. I don't think we can claim any players HATE each other, we don't know them that well. But there are definitely signs of dislike that are either one sided or two sided.
Serena vs Maria
Maria vs Vika (Stuttgart shade)
Maria vs Aga (Isn't she back in Poland already?)
Aga vs Vika (Dubai handshake)
JJ vs Bartoli (Stanford press conference)
Davenport vs JJ (loves to shade JJ during commentary, Beijing 2007 ball drama)
Rezai vs JJ ("As a player, she's okay. As a person, she's horrible.")
and the greatest one of all....
Schnyder vs Conchita Now THIS was hate