losing my mind over lack of sleep

Court0026

DD is a terrible sleeper.  SERIOUSLY.  She has resisted sleep training methods month after month.  She used to at least let me nurse her to sleep (which only works for 1 nap as it is because DS won't be quiet long enough for her to fall asleep nursing when he is awake).  She has never gotten up fewer than 3 times a night, and now we are up to 4.  She is taking 1 nap a day and it is usually for only 30 minutes.  I feel like I am losing my mind and I am certainly listening to her cry more than I would like.  AHHHHHHHH!  vent over.