Hard luck, that really is a lovely bike!
I hope you get the right sale for her but if you really are desperate, have asked what the dealer will offer you in part-ex? or even dare I say it...'We Buy Any Bike .com' ?
If it's against another bike, dealer might surprise you...especially if it's the only way their going to complete the sale of the bike you have put the deposit on (V 300 I'm guessing
) or the online route will obviously offer you less but again you don't know until you try, might get you out of a hole. I was pleasantly surprised with the offer they made on my Vauxhall Zafira, (We Buy Any Car of course) not as far off part-ex price as I thought and they eventually came up in price too.
Whatever you decide to do, good luck....I'd buy if I had the money that's for sure!