Ladies...what would you do?

Morning all. I have a dilemma...its not earth shattering but I would appreciate your opinions :)

I was out with some friends last weekend, and a colleague of a good friend who I had only met once before. We were all chatting away and being merry (it was not too messy at this point of the evening) and whilst I was chatting away animatedly my hand accidentally knocked over my glass of red wine, which tipped all over the chair - which had my friends colleagues gorgeous (barely used) cream leather designer bag on it. Of course I apologised profusely, jumped out of my chair, got some soda water from the bar quick smart and raced to the bathroom with it to try and get some of the wine out before it stained, but despite the fast action, it seeped into the leather and stitching and we didnt have a lot of hope in getting it out. I felt absolutely terrible. Why couldn't it have been my cheap bag! Anyways, of course she was a bit upset about her bag as she hadnt worn it much and I am guessing by the brand it cost about AED 3000 new. She was very good about it though and said several times she knew it was an accident and not my fault and not to worry. She said she would try and soak it some more when she got home and would let me know (via my friend who she works with) how it all worked out.

Anyway, I asked my pal and she said the bag is all but ruined and now I dont really know what to do. She said it was an accident and I shouldnt beat myself up about it, but my apology will not bring back her beloved bag. I am not an expensive bag girl myself but know what these designer ones are worth and what they mean to people! I asked my friend what I should do. She said perhaps a 'donation' towards a new bag would be a nice gesture. She could pass it on to her and would not ask any further questions. The thing is, I cannot afford to buy her a new bag, I am pretty pressed for cash at the moment and I guess in a way if you go out in your best dressed there is always a risk of wine spillage or cigarette burns and the like and often you just have to deal with it without any compensation. In this case, as there is always a chance I will bump into this girl at some point again, I feel I should do something. (and unfort a replacement karama bag will not do!) SO - do you think AED 500 cash towards a new bag and an apology letter would be gratefully accepted or would it be a bit insulting? That is a lot of cash to me right now and probably the best I can do. I would appreciate your thoughts as I am sure there will be many views! Thanks girls xx :(