Sudden really long naps?

So typically my LO takes really short naps, and then takes a decently long nap around 1pm. Well today she has been napping basically all day. She's 8 weeks this week, and the last two days we spent out and about so that may have something to do with it but I'm not sure. She was up for maybe 1 1/2 to 2 hours this morning, but since then she's basically been waking up to nurse and then going right back to sleep. Im also thinking maybe her 8 week leap has her extra tired? Not too sure but just wanted to see if your LOs were up most of the day or took really long naps and then suddenly switched to the opposite? Is this normal or should I be worried shes getting sick?