In 2008, Valentine was forced to take sick leave for one month and executive producer, Susan Bower, made the decision to temporarily recast Mc Leod's Daughters actress Michala Banas in the role for a month.
Valentine took leave from Neighbours in 2010 due to ill health and returned to the set in January 2011.
However, she said that the only way she could "tackle" the role was to make Libby her own.
Libby's relationship with Darren Stark (Todd Mac Donald) comes to an abrupt end after he kisses Janae Timmins (Eliza Taylor-Cotter), but Libby soon finds romance again with Daniel Fitzgerald (Brett Tucker).
[...] I just think Dan and Libby are very similar like with their careers – they've got a lot more in common, they're both teachers and they're both very articulate and educated.After breaking up with him, Libby and Brett lose their virginity to each other.Despite feeling awkward, they both agree that it was the right thing to do.Libby develops a crush on Luke Handley (Bernard Curry) and he begins to develop feelings for her too.They share a kiss, but Karl is disapproving of the relationship and Luke is uncomfortable with the age difference.Alan Fletcher and Jackie Woodburne were cast as her on-screen parents and Benjamin Mc Nair and Jesse Spencer were cast as her two brothers.Of her comeback Valentine said "I really felt like I was coming home and it was very easy to slip back into the role of Libby, she's like an old friend.Luke then tells Libby that they can only be friends.Libby begins a relationship with Sonny Hammond (Tom Hutchings), but she grows uncomfortable when Sonny wants to take things further.When she is threatened by a thief, Karl is convinced the job is not safe, but she goes back to work there.She leaves for a cadetship at the Erinsborough News.