Your baby girl is growing up & is more & more curious of the surroundings. I will advise you to play by ear. If she is unwilling to take long nap you might want to try to eat, play, sleep method. After a meal, plan some activities suitable for her age like story telling, exersaucer, jumperoo or an activity mat. Let her use some exercise to make her tired & she might nap longer. However, if she doesn't nap longer. Do not fret. Try to let her play with safe toys of her age within your vision. It's actually good to let them self entertained for a while to train them to be more independent