L.B.
You may have to change your routine a little bit to get her more sleepy before putting her down in the crib. A little cuddling after the feeding before you put her down might be in order.
She's just excited and wants to keep playing is all so calming her down a little farther than you normally do is probably all it will take.
Another option is some very soft gentle music in the background and controlling the light, especially sun light, in her room. Making her room dark like it would be at night might also help with afternoon naps. They make blinds that block out light now. Or just covering her window with a blanket to block out the sun will work just fine.
Hope those help.