‘The books follow the adventures of Kylara Vatta, a young member of the Vatta family, which runs the interstellar shipping corporation Vatta Enterprises.’
The last in the series is published in the UK in April 2008.
‘Trading in Danger’, Book 1 of 5:
http://www.amazon.co.uk/Trading-Danger-Vattas-Elizabeth-Moon/dp/1841491683/ref=pd_bbs_sr_9?ie=UTF8&s=books&qid=1204232360&sr=8-9