I would send the email as the others suggested, or phone and ask the same questions and request an answer by the next day unless there is a good reason for waiting.
My last time interviewing, I had a job offer on the table, but 2 more part-time interviews that would have allowed me to put together another "full-time" job. The last interview was several days after I received the offer, and I had to leaved her waiting for longer than I would have liked to, just from the logistics of having several families to meet. Maybe she had one more interview and wanted to be sure before committing to you..... Good Luck either way. I know it's not an easy process.