So let me get this right, you lent her the money on the basis that you only want paying back once she had concentrated on paying off her other debt? So she uses her bonus to pay off some of that debt and you're pissed off at her?
Forgive me if im reading it wrong but it sounds to me that she did exactly what you told her to?!

Dont get me wrong, I do feel for you lending money to a friend and not seeing it back for a long time, im in an identical situation where I lent a friend £5k over 2 years ago and havn't seen a penny of it back but hey ho.