Fussy 6 week old helpppp

Hi mommas I’m a ftm and my little girl is such a happy baby in the morning but after a couple of hours she’s non stop fussy and sometimes cry’s for no reason like she has been fed she’s got a clean diaper on I try soothing her and nothing helps. She fights her naps a lot so I’m thinking she’s overly tired, but when she finally does it’s a three hour nap then she’s awake and back to fussing like I feel like I can’t catch a break. Once it’s night it’ll be like 10 and I do our bed time routine but she’s still wide awake and doesn’t want to sleep I need help!! ☹️ has anyone else experienced this??