Should I wake her up?

My almost 4 month old has been on a pretty good schedule... down by 7:30pm , wakes 12-12:30 to eat and goes back down until 7-8 am.

Well it’s now 9am and she’s still sleeping! It’s awesome she slept in because I was able to get a lot of things done this morning but I’m worried her schedule will be thrown off tonight if I let her sleep too long.

Should I let her sleep? Or wake her up?