4 month regression?!?! 😱😱😭

Hey girls, my LO turned 4 months on the 29th and we are having some serious nap time issues :( she feeds every 4 hours so our schedule was always feed 7am - sleep 9am-11am then feed, activity nap 1pm-3pm. She would then have a 20-30min nap at 5pm and then bath at 6, story and bottle asleep by 7/7.30. Suddenly she will only sleep 40mins at a time and fights every single sleep then gets fussy. She's then in bed by 6 cause she's so exhausted and thankfully that isn't a struggle cause she just can't stay away hardly through her bottle she is that tired :( is anyone else having day sleep issues? I don't know why it's all gone downhill and I've tried everything. I use White noise, she has a paci etc. she always went to sleep no problem. I can get her to sleep if I go for a drive or a walk but my partner has the car most days and it's pretty rainy and cold with me for walks and wouldn't want her to get into that habit. :( just feel like all I do is question my abilities.