Slammed, Hopeless and Maybe Someday are a series so if you haven't definitely check out the other books, there's a little known short story for the Slammed series called "A Father's Kiss" which takes place after "This Girl".

"Without Merit", "Regretting You", "Heart Bones" and "Reminders of Him" are missing from the list, so definitely read those :D

Colleen also has two short stories that are not related to any other series, which are called "Saint" and "The Dress". That is everything Colleen has written so far.