I dread putting my 6 week old to sleep for bed because I feel so helpless and lost.

Our mornings start off (relatively) good...she will take a decent nap in the morning and in the afternoon...but come 5pm, things go downhill... Everytime she cries, I nurse her but she doesn't seem content afterwards so she will continue crying... Eventually , 2-3 hours later, she will fall asleep....

Any advice? Perhaps she is colic??