((((HUGS)))) Maura, i'm so sorry to hear of the hard time you're having at the moment with your little one. I know how difficult sleep problems can be, and how they can affect your relationship with DH and your ability to function during the day - its no fun.
As you've said, she's waking up at roughly the same time each night, so one method that you could try is the wake-to-sleep method. This involves rousing your dd from her sleep 1 hour before she would normally wake - do something like change her nappy, don't engage in conversation as you don't want her to fully wake, but as you pop her back down, say, its not wake up time yet, lets go back to sleep. She may be a little cranky as she goes back to sleep, but it should prevent the usual wake up in the middle of the night and help her to sleep through to the morning. Do this for 3 nights running and see how you get along.
Also, does she still have a nap during the day at all? If so, what sort of time is she napping and for how long?
I hope that this helps, we're all here for you, please keep us posted.
Take care, Rachel xx