If she is dropping a nap you'll probably find you'll have some days with three naps and others with two. It is a bit of a process and won't happen over night and you'll just have to take each day as it comes in terms of timings and routine. Also, I've found now that we are settling into two naps a day my babys naps are getting longer again.
Mine started to drop around 7 months but the process took about a month so we had a weird schedule for a while, just had to go with the flow