Need advice please

Hey mamas. I need some advice. I have a 2.5 year old daughter and my other daughter just turned 1. They both share a room. My older daughter has been refusing naps for the past 3-4 months now. It’s an absolute nightmare. She goes in her crib and gets totally naked and throws her diaper off. I’ve been to the pediatrician multiple times for help and see what’s up but nothing helps. She is so so exhausted by the end of the day she just throws fits, screams, hits, and ends up literally in bed by 5:30. Idk what to do and feel like I’m at my wits end trying everything in the book. I lay with her, have her in my room, try toys, try animals, anything. And she just doesn’t want to nap. I end up taking her out bc my 1 year old sleeps with no problem. Isn’t it too early to give up naps? Please mamas..any advice!?