You may want to consider the Sauce Light Wand. It glows in multicolors, or can cycle through colors depending on what mode you choose. It will automatically turn off after about 10 minutes. It can be made to stay on continuously if you set it to, but most of the time, a 10 minute light show is enough. It uses 1 AA battery at a time.
They also make some night lights that plug into the wall called the Light Orb, or the Light Saucer, or the Light Washer
If it is a pink light that she wants, this light can deliver that. You can set the color of the light to any color that the 3 led's can generate and since they are red, green, and blue, you can make just about any shade in the spectrum. personally, I like when the light washes from one color to another, but it also has hidden light show modes, including a red,white,and blue light mode which is kind of cool. I have given some of the sauce plug in lights to friends with kids, and they love them. They are way more cool than any other night light I have seen.