Fate's Anvil2 books in series
Morgan Mackenzie had a very bad day.
First at work, then at home, and then her bathtub fell through a portal to another world, with her in it. Now she's stuck thousands of miles from any sort of civilization with nothing but the bathtub and a lace puffball scrubby. But she learned magic, so that's sorta nice. Now if only she could find some clothes....