Hmm... well, Rule 240 looks interesting:
"RULE 240: FLIGHT DELAYS/CANCELLATIONS
A. Flight Schedules are Not Guaranteed
Delta will exercise reasonable efforts to carry you and your baggage according to Deltas published schedules and the schedule reflected on your ticket, but published schedules, flight times, aircraft type, seat assignments, and similar details reflected in your ticket or Deltas published schedules are not guaranteed and form no part of this contract. Delta may substitute alternate carriers or aircraft, delay or cancel flights, change seat assignments, and alter or omit stopping places shown on the ticket at any time. Schedules are subject to change without notice. Except as stated in this rule and in Deltas Customer Commitment (Rule 200), Delta will have no liability for making connections, failing to operate any flight according to schedule, changing the schedule for any flight, changing eat assignments or aircraft types, or revising the routings by which we carry you from your origin to destination."
So does Rule 270: "RULE 270: VOLUNTARY REFUNDS
A. Fully Refundable Tickets
If your ticket was purchased at a fare that is fully refundable in whole or part, Delta will issue a refund of the refundable portion of your ticket at your request. You must surrender any unused portion of the ticket at the time of the refund request. The amount of the refund will be calculated as follows:
1. If no portion of the ticket has been used, Delta will refund the total fare and all taxes, fees or charges paid.
2. If a portion of the ticket has been used, Delta will refund the difference between the fare and charges applicable to the ticket as issued and the fare and charges applicable to the transportation covered by the used portion of the ticket.
B. Nonrefundable Tickets
1. General Rule
Delta will not refund any portion of a fare that is nonrefundable, and Delta will not refund any taxes, fees or charges collected upon nonrefundable tickets.
2. Application of Unused Ticket toward Future Purchases
Delta may permit a portion of the fare paid for an unused nonrefundable ticket to be applied toward the purchase of future travel on Delta, as set forth in the applicable fare rule.
3. Upgrade/Downgrade of Nonrefundable Tickets
Delta may permit passengers purchasing certain nonrefundable fares to upgrade or downgrade those tickets after purchase, as set forth in the applicable fare rule."
The OP might want to check over at
www.flyertalk.com, perhaps even register so she can post there - especially since it appears that nobody who's read this question yet HAS gotten a refund. But based on the above - it doesn't look promising. Or, has the OP maybe tried searching here on the DISBoards for "Delta refund" or "refund Delta" or anything? Maybe there are some older results.