5.5 month old fights sleep everytime

my 5 month old has recently been very fussy for naptime and bedtime. She doesn’t sleep that easily. Before it was easy to put her to sleep but now its alot of rocking, walking and bouncing and her fighting us off. That being said, at 4 months she was a good sleeper. now she would just keep arching her back, start fussing and then ends up crying. the sleepy cues are there too; she’s rubbing her eyes alot, yawning and rubbing her eyes on me too but doesn’t want to sleep easily. I am very exhausted and not sure what to do. I have tried everything and nothing works!! Any advice, tips or tricks?? TIA