Really sorry to hear this. I usually don't recommend to use sob stories in visa applications, but IMO you can lean on that in this special case. Did you explain in your letter than you are a scholar? Did you submit any documents regarding this? You could still include a letter of explanation that you had deposited the money to your mom's account (since it was less than 3 months) and show your side of the transaction as well.
I don't think all hope is lost, but you just have a very, very, slim chance. If you can somehow get a job offer, that might also help.
