i remember reading this story a long time ago in middle school, so it was definitely published in the early 2000's maybe even the 90's. the cover art was holographic i think and and had a picture of a face covering most of it.
these are all the details i remember. i hope i wasn't having a fever dream.
so this girl lives in the future with her selfish mom and she has like a closet where she can pick out clothes from a computer and change their color on the screen before putting them on? and i think she looks into a fountain that has like mirror pieces in it and she looks really hard at it and gets sucked into it to another time or possibly another world? it's very primitive and she doesn't adapt very well.
i remember she had some kind of implant in her arm like a communication device. she discovers that the angle of the reflection of the mirror piece caused the sudden transportation. she later goes back to her own world and brings back medicine for the people of the primitive world that she visited.
where she comes from it's all very futuristic and fancy and has a lot of technology and i remember she had a weird name like glimmer or something like that
any help would be appreciated this story has been gnawing at my subconscious literally for years. it was one of my favorite stories when i was younger and it's probably not even that good now but i would still like to know the title!! thanks again.