moms- help! losing my mind...

Cristina
My daughter is just not napping lately and having terrible sleeps because of It. Is anybody else going through this? She used to nap fine and she's not sick, no ear infection ect ( we had a doctors appointment last week). But man this is hard! She wakes up at 6am for the day and then has a 20min nap 2.5 hours later and now she's wide awake in her crib when she should be going down for a nap. 
Yesterday she stayed awake 6 hours straight 😣
Any advice? Anyone going through the same thing?