Maybe there is a chance to execute function calls against EtherDelta smart contract (ForkDelta is just a fork and as far as I know it uses EtherDelta smart contract and wallet). Go to Myetherwallet, click on "Contracts" and select the EtherDelta contract from the dropdown. You have to choose "Withdraw" and enter the amount (but the value is in Wei, so you have to put something like 550000000000000000 - I used this value for 0.55 ETH). This method worked for me when I wanted to withdraw my funds from EtherDelta during the period their website was hacked, so I`m not sure it works in your situation. I'll keep my fingers crossed for you!