What secrets did Lillian Jean tell Cassie?

From the text:

When we were alone, she confided her secrets to me: the boy she had passionately loved for the past year and the things she had done to attract his attention (with no success, I might add); the secrets of the girls she couldn’t stand as well as those she could; and even a tidbit or two about her elder brothers’ romantic adventures. All I had to do to prime the gossip pump was smile nicely and whisper a “Miz Lillian Jean” every now and then. I almost hated to see the source dry up.