michigammemom That's a pretty strong look and if your daughter is like most tweens, she will hate pink in a couple of years. Rather than wall paper I would suggest a wall color that you can both agree on and some peel and stick wall decals that can be easily changed.
elklaker I agree with going with something easily changed. Since my daughter was 12, I have redone her room 3 times in 5 years. Girls are fickle. I love the idea of a neutral wall color and decals and accessories to change up the colors and styles.
E Klo What if you could convince her to paint one wall a dark grey or even black (you can just killz over it in a couple of years when she out grows this phase). Then go HERE - http://www.wallzaz.com/kids-wall-decals/ and make those lips into a wall decal. Same look - but way easier to get rid of then wall paper when she turns 15 and decides that neon owls are really more her thing. ;)
Prime Walls Your daughters choice is quite bold, and quite dark! Perhaps using the pink for the majority of the paper, and doing an accent wall. Compliment the accent wall with a dark grey vs. a black. You will still get great contrast and achieve the look she is hoping for!
These wall papers are easy to install and have such a great wow factor to them.
http://www.dezignwithaz.com/lips-kiss-wall-clings-p-676.html
Sit down side by side with your daughter and a pad of good drawing paper. Ask her to sketch out and describe what she wants. Take notes.
These activities will help you both understand what is desired for her bedroom.
These wall papers are easy to install and have such a great wow factor to them.
Just a few of the vast assortment of product;
http://www.primewalls.com/products_residential/viewsku/949
http://www.primewalls.com/products_residential/viewsku/80
http://www.primewalls.com/products_residential/viewsku/466
Prime Walls