Dian Curtis Regan 
Monsters in Cyberspace [EPUB ebook] 

Autumn brings monster surprises to Rilla Harmony Earth. A computer and modem for her attic bedroom at Harmony House Bed and Breakfast means she can surf the Internet as Earthgirl7. Unfortunately, the monsters find their way into cyberspace, too, using Rilla’s screen name–instant trouble! But the best part of "connecting to the globe" is that Rilla now has a way to search for her father. Meanwhile, clases begin for the home-schoolers, bringing Rilla back together with her one true love.