Witching Hours?

Baby will be 4 weeks Wednesday - Shes usually a pretty good sleeper sleeping 3-6 hours at a time. Every evening between 5-10 she gets fussy - Feed, Change, Gas Drops, Rocking, Singing etc Repeat she will take a 10 min cat nap and start crying where she makes herself breath heavy. I've tried putting her in her swing, boppy and crib. Finally about 9/10 ish she will fuss and be out til 3/4 AM.

Any ideas on how to help calm her at this age since shes too little to self soothe?