I think you are very right. Kids need that extra sleep until around kindergarten age range. Maybe it's not so much that she doesn't want to take a nap anymore, as she's putting you on a slightly different schedule. For instance: Has her sleep throughout the night changed at all? She may not want to take a nap until later, or maybe she needs one earlier, and by the time her "normal time" nap is, she's so frustrated she won't go down to save her life. Start looking for any signs at all that say she's tired...Because we all know that a typical two year old isn't going to be honest about it! So watch for irritability, eye rubbing maybe, frustration with simple things, unusual sibling rivalry, toy throwing, whining....those can all be signs...Otherwise, perhaps she may be getting her two year old molars in and they both her mostly during the day....Check that first just to be sure. Good luck, and let me know how it goes!