Hi Cindy!
I just recently transitioned Ethan over to 2 naps, and dropped his catnap. But I knew he was ready, because most of the time, he wouldn't take the 5 pm nap. I would try to put him down, and he would either cry, or he would just crawl and roll around in his crib until I came to get him.
So, that went by the wayside. BUT - if your dd is still wanting that catnap, I would still go for it. I think you'll see when she's ready to drop it, either she won't want to go down for it, or she'll fight going to bed at her regular time (cause she's not sleepy enough). I'd stick with it for now, until you notice more signs.
Oh, and two things: Ethan still has to have "quiet time" in his room sometimes (not every day) around 5:30 or 5:45. That consists of me rocking him and him with his paci, and sometimes I'll play a cd. He still will get cranky around that time of day sometimes, and this soothes him down, and helps us get through his dinner!
And the second thing - Ethan has not slept any longer at his 2 naps just because he dropped the catnap! I wish he would!
Good luck!