How can I tell is my LO is ready to drop a nap?

Ma

My LO used to nap every 3 hours. Once in the morning around 9 and then again around 1. We'll she naps from 9-10:30 and then won't nap in the afternoon or if she does its like 15 minutes. Does that mean she's ready to drop the morning nap and just nap in the afternoon?