Screaming Naptime

OH MY GOODNESS... I am getting so frustrated! I have really been trying to get Gracie to take a nap every day around the same time. The weekends, she usually falls asleep in the car on the way to church, or on the way home from church, and then she will usually stay asleep. However, Monday's roll around and then things are just so screwed up. Well... today is another day of screaming naptime. The weird thing is that she was ASLEEP in her exersaucer, and when I picked her up, she was still asleep... then as soon as she got to her bed, she wakes up, SCREAMING!!!!! This is getting ridiculous. Right now... as I write this, she has screamed, in her bed for 20 minutes. Will this ever come to an end? Will she ever just accept that it is naptime. I would not usually put her in for a nap this early, but she was asleep! What am I doing wrong? ARGH!