The 28-year-old singer admitted that she is no longer friends with her former Atomic Kitten bandmate and feels confused by her change in personality.
Speaking to new! magazine, McClarnon explained: "She isn't the same person she was. We have a mutual friend and I know she's not okay.
"We don't talk. We haven't fallen out, but we haven't stayed in contact. I saw her at the MTV Awards in Liverpool last year and it was strange. It wasn't how it used to be."
The popstar added: "She used to be a real laugh. She would give me advice on men and relationships all the time. We were so close. I know I don't have a place in Kerry's life and she doesn't in mine. I don't wish her any harm though."
McClarnon has previously claimed that she would be willing to help Katona through any personal problems.