Ex girlfriend sends mixed signals

Ex girlfriend from a LDR is sending really mixed signals.She is either really cool and friendly or cold and distant.If we don't fight for stupid reasons we have a great time but usually she misunderstand everything I say.If everything is fine and I don't talk to her she asks me if I am mad at her and why I don't talk to her.But usually I am the one who has to start the conversation.Is she still have feelings for me or she is just seeking attention?She is single since we break up,she just had some casual sex,we aren't together for a really long time.