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The White Queen is nearly aways portrayed as an old woman. Maureen Stapleton was 58 when she played her,Penelope Wilton 52, Carol Channing "jam tomorrow, jam yesterday" 64, Eva Le Gallienne was 56. Nanette Fabray and Louise Fazenda were the youngest I could find, at 46 and 38 respectively, when they donned the crown in 1966 and 1933. Anne Hathaway will only be 27 when the movie arrives.
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Perhaps Hathaway only has a cameo. The White Queen is an elusive character in the Wonderland mythology. She appears only in Through the Looking Glass. She speeds away quickly from danger and sometimes she's altogether more invisible than the Cheshire Cat. Note that she doesn't appear at all in many adaptations of the Alice tale. By contrast, her sister The Red Queen (played by Helena Bonham-Carter this time) also known as "The Queen of Hearts" is always present, accounted for and ready for heads to roll. I have it on good authority that her favorite Tim Burton is Sleepy Hollow.
*Colleen Atwood is not listed as Alice's costume designer on IMDB but no one is. I'm assuming that she's the one, given her 7 previous collaborations with Burton.
** If you've never seen Dreamchild (1985) and are interested in the Lewis Carrol books, I urge you to do so. It's a really creepy biopic'ish take on Alice in Wonderland with a sensational performance by Coral Browne (Mrs. Vincent Price) as Alice all grown up.