Feeling defeated 😩

Nothing is working. Not only is my 6 month old crying for bedtime, but now for nap time as well. I nurse her till she is done and now she won't even lay still to rock with me til drowsy. I lay her in her crib and she screams. I've played white noise, she cries. I've done 5 minutes crying than soothe repeating and it's not working either.. What do I do other than pick her up and let her forget about nap time?! 😫😫😫