My almost 3 year old used to LOVE her school/daycare, but the past couple months has been whining and crying every morning that she doesn't like school and doesn't want to go. But when I pick her up at the end of the day she's always playing and having fun. When I ask her then if she likes school she says yes. Do you think this is a normal 3 year old thing or do you think something else is going on?

some background...She's been in daycare 3x week for over 2 years. when this first started happening was when some of her friends got transferred into the next class. Now she's been transferred into that class too and she's still fighting going every day. I also have a newborn at home, but this behavior started before he arrived.