As it happens, I have another fanfic-created heroine who is also a teen-age girl called Alex: Alex Mack (she was originally created as a version of the TV heroine, but her author Diane Castle swiftly took her in so distinctive a direction that she now counts as an original creation. She has her own fandom, the Teraverse, and I have written a few fanfics for her and related characters. https://www.tthfanfic.org/Story-28614/DianeCastle+The+Secret+Return+of+Alex+Mack.htm