Honestly, let it go.
When my brother in law had some financial and marriage issues, we "loaned" him around $30k. $10k was for back mortgage payments so his house wouldn't get forclosed on, we also paid for the attorney for the divorce - another approximately $20k.
We got the $10k back when he sold the house, and he started making payments on the attorney, but got in an accident and then couldn't work. So payments were sporadic. Plus, his priorities have ALWAYS been screwed up - he went to Mexico with his new girlfriend. That was the last straw for me, but since this is my husband's only brother, it had to be "I had to get over it." So I had my husband call and forgive the debt.
I didn't get pissed about it again until my brother in law mentioned that he had paid it all back. Then I blew my stack. But to not be the bad guy, I stuck my husband in there again to explain, no - we forgave the debt.
When my brother in law had some financial and marriage issues, we "loaned" him around $30k. $10k was for back mortgage payments so his house wouldn't get forclosed on, we also paid for the attorney for the divorce - another approximately $20k.
We got the $10k back when he sold the house, and he started making payments on the attorney, but got in an accident and then couldn't work. So payments were sporadic. Plus, his priorities have ALWAYS been screwed up - he went to Mexico with his new girlfriend. That was the last straw for me, but since this is my husband's only brother, it had to be "I had to get over it." So I had my husband call and forgive the debt.
I didn't get pissed about it again until my brother in law mentioned that he had paid it all back. Then I blew my stack. But to not be the bad guy, I stuck my husband in there again to explain, no - we forgave the debt.

. Lesson learned big time and it never happened again either. I have forgave her for that but I have never given her the opportunity to get over on me again

well, a lot of the time they stink. 
Very proud of him, he said thank you and moved on. He asked me about it later and I told him I agreed that it didn't seem right, but we don't know the circumstances and we can't tell somebody what to do with their money. Personally between me and all of you, I thought it was low......especially to do it in front of the others. Shameful.