The Witching Pen series

The Witching Pen (The Witching Pen series Book 1), by Dianna Hardy
The Sands Of Time (The Witching Pen series Book 2), by Dianna Hardy
The Demon Bride (The Witching Pen series Book 3), by Dianna Hardy
The Last Dragon (The Witching Pen series Book 4), by Dianna Hardy