The Stars in Their Places : A Mist of Stars Book One

The Stars in Their Places is Volume I of the quartet A Mist of Stars.
Saira, 16, befriends an exotic vine creature, a being half animal, half plant of mythical size and appearance. Together they take off and travel together to find the vine creature's homeland where the 'stars are in their right places'. Their world is Earth several hundred years in the future, a lot has changed, rising sea levels have redrawn the shapes of major landmasses and Earth's population is much reduced.
This is a story in four volumes, the second, third and fourth volumes take Saira further and further away from her home planet, Earth. While she travels, Saira changes in ways that she at first doesn't understand.