I am far from a Princess expert, but here are my observations:
Princess Fantesy Faire
Meet & Greet is normally open from 9:00am to 6:00pm
1 This is called "Disney Princess Royal Walk"
2 The wait time is usually 40 minutes to One hour.
3 There are three stations used.
4 The usual Princesses are: Two or Three of: Aurora, Snow White, Cinderella, Belle, Arial (gown), Tiana, Jasmine, and on occasion "Princess Minnie".
Beginning at 10:00am on weekends and the summer, about every 45minutes they start with the Coronation, then Storytelling, Coronation, Storytelling, etc.
Coronation Ceremony
1 This is almost always with the ""Big Three" Aurora, Snow White, and Cinderella.
2 When the Coronation Ceremony is in process, other Princesses are at the Meet & Greet.
3 After only the FIRST (10:00am) Aurora, Snow White, and Cinderella will usually,
very briefly, meet and sign autographs.
Storytelling
1 This is a short (10-15 min) story with one Princess and an assistant.
2 This is most often Belle, Aurora, Arial, or Cinderella.
3 They will not meet or sign autographs, and disappear very quickly.
Other locations:
On either side of the Castle:
After the band shows (11:00am, 2:00pm) and when there is not an event in Plaza Gardens to the left side (usually 11:30, 12:30, 1:30, 2:30, and 3:30) they often come out to either side of the Castle.
On the
right side: Snow White can often be found at 2:15 at her wishing well, sometimes with the Whicked Queen. And Belle or Cinderella can be found to the right, but not at Snow White's Wishing Well.
Left Side There often will be one or more at the Plaza and the path to the castle. Often there will be Arial, Cinderella, and/or Aurora. Also you will often find Mary Poppins and Bert.
Inside the Castle Aurora, Cinderella, and/or the Fairy God Mother can be often found just inside the castle near BBB. Hint: There can be a long line for the Fairy God Mother inside the castle, but Snow White will be standing all alone at the wishing well 30' away.

This is because nearly everyone uses the main entrance instead of the side paths.
At the
Entrance:
On weekends or during the Summer one or two Princesses will sometimes be be at the Entrance. This can be hit or miss.
Aladdins Oasis behind the Tiki Room Is where you will find Jasmine, and/or Alidden. (2:40-3:00 and other times.)
Tangled
You will only find Repunzel and her meet and greet in Fantasy land.. The wait time is often more than an hour.
Hint: If you must SEE Repunzel she often takes breaks. If the Door is closed she is not there, go to the path between Casey Jr. and the Resturant, and in a few minutes she will walk by and wave on her way back.
New Orleans Square:
Some days, Tiana will have short shows, and very briefly meet and sign.
lately I have found Angelica from the New Pirates movie in NOS.
California Adventure:
You used to be able to find Aurora on Hollywood Blvd at park opening.
Mulan can be found around CA near the Warf sometimes.
The Princesses at Arials Grotto never leave the Grotto. Go back to DL.