LO sleeping a lot during day all the sudden?

Daphne.
Hey ladies!! My LO is one month and one day and lately she's pretty fussy during the day and hard to put down for naps ... today she woke up for the morning around 7ish and has woken to feed twice but wanted to go to sleep right after (typically she'd be fussy and I'd be walking her around or attempting to play with her haha) ... should I keep letting her sleep? She does pretty well at night so I'm worried letting her nap all day might affect her evening! Last night we couldn't get her down until midnight but she slept 6 hours after! So maybe she's exhausted?