The 30-year-old entered rehab for depression issues, alcohol addiction and a prescription drugs dependency following her split from fiancé Tom Crane in September.
Harding found love with Dutch businessman Theo de Vries in rehab, but the pair split in December and left each other sporting injuries after a vicious New Year's Eve clash in Austria. Both could still face assault charges over the fight.
It has now been claimed that Harding is channelling her pain into material for her debut solo album, apparently attracting interest from three different record labels in the process.
"Sarah's been jotting down lyrics and writing songs for the past few months," a source told The Mirror. "After the year from hell in 2011, she is now desperate just to get back to her first love - music.
"She's had a few meetings and is getting a lot of interest from labels but hasn't decided which one to go with yet. There is some very raw, heartfelt stuff – not the kind of thing people will be expecting. Sarah's had some pretty wild experiences and wants the album to reflect this."
Harding recently claimed that she feels "messed up again" in the wake of her split from de Vries.