I'm having trouble finding an old book, I remember the basic plot, but I can't remember the title. I'm hoping someone has a better clue than it.

In short the book is about a young girl/woman who can see and manipulate "rings" that can be used to pass through to alternate worlds. The two main worlds are a rocky hot world in which travelers become furry four legged beasts, the other is one is an ocean world where the travelers become small aquatic creatures. The plot revolves around her escape from her prison as well as the discovery of her past including "doubled rings" and some alternate time selves as well as the discovery that her captor, her local bully, and an elderly gentleman are all the same person duplicated with the double rings. I can't remember the names of the characters, the author or title, so I'd really appreciate it if anyone knew the title of the book.

Hey guys, Found it.

The book was Spaceling by Doris Piserchia
Most of her books where from the 70's and 80's so they are a little dated although still great

Other great obscure books

Queen's Squadron by R Meluch; A bored immortal tired of life joins the most hazardous and elite squadron in space, the universes only ftl squadron. Along the way she meets a feral ace who makes her realize the flaws in her nihilistic views

Although a book I'm still having trouble finding

?dayrunner? daywalker? Day_____?
A book about someone who evades the worlds organization of 6 days stoned 1 day awake by leading 7 lives, one for each day. Ending in a escape from the government as a "day_____"

Any help appreciated much