Return deposit?

a bit of a novel, but here goes:

We own a car, which is currently on finance. We want to sell this car. Spoke to finance company who said that was fine, just let buyer know that money is owed, and then they can pay $ directly to finance company. that way they will know that there is no money owing. this is perfectly legal and very common according to finance company.

So we listed car, a woman came and test drove it. Liked it, wanted to buy it. She gave us a $200 deposit (sold it for $9400). We agreed to get it new rego/wof, which we have done. She has now come back and said she doesn't want to buy car as her friend, a lawyer, said that it will take a week for finance company to process payment and they will still have a claim on the car during that time and she wants her deposit back.

I feel like this is a bit unreasonable - we have paid for wof/reg/TM success fees which all come to about $200, plus we have spent a whole day trying to sort this out. I think that she is the one that has pulled out of a perfectly legal deal, so therefore she forfeits the deposit.

what do you think? advice greatly appreciated.

I would say that since you were up front about the finance deal at the start then she has no basis for a refund.
The whole point of a deposit is so that if the buyer changes their mind the owner can cover costs. Which is exactly what you did with the money.
Do you have a lawyer friend?
If you do, just get them to write a fancy letter with all the jargon, that's what I do when people try to take advantage.
I would imagine there would be something in the consumer guarantees act about deposits, maybe google it?

I agree with PP - she knew the deal beforehand. Has anything else happened?? Haha I'm with Jazzy people like that bring out the fight in me too, I hate being screwed around!!