Skeletons in the closet (Secret of the Unicorn Queen Fanfic)

This is my fan fic for the YA 80's series called The Secret of the Unicorn Queen which were written by Josepha Sherman, Gwen Hansen, Dory Perlman, and Suzanne Weyn.

From the back cover: When her eccentric friend Dr. Reit invents a machine that acts as a portal to another dimension, Sheila McCarthy accidentally falls through and finds herself in the kingdom of Arren. There, Sheila befriends a band of warrior-women. Astride unicorns, they gallop toward a dazzling city made of marble. But will they arrive in time to stop the evil king and his wicked wizard henchman from carrying out their deadly plans? And will Sheila ever be able to return home?

Well, Sheila did go home but the story didn't end there.
The hope of ever getting back to the world of Arren is all but lost to a now adult Sheila, after learning that her beloved Dr. Riet has passed away. The magic she once wielded and the friends she made will only ever be visited in her memories. Or can they?

All grown up with a teenage daughter of her own, Sheila begins to notice weird things happening around her. At first she shrugs them off as coincidence, until the dreams begin. In them, her unicorn warrior friends beg for her help. The boy who was her first love is missing, impossibly captured by an age old enemy. Even if Sheila could somehow help them, she'd stuck in her dimension--but what if she could go back? Would she risk leaving her daughter behind?

Sixteen year old Daryn finds herself all alone when her mother suddenly vanishes in the middle of the night. With no explanation. No note. No reason for her to have run off. But that's not even the strangest part. Suddenly she's been having crazy dreams depicting the made up stories of her childhood. Dreams that are so real, they have her questioning everything she thought she knew about her eccentric mother. Is she brave enough to follow her mother into the unknown in order to find the answers to questions she never thought to ask?