She and mortal boytoy Bill are so awesome they managed to catch the eye and heart of a confirmed DC Girl here. A quick look at her Marvel Database Project
page gives her first appearance as February 2008 - is that all? - the creation of J.M. Straczynski and Oliver Coipel.
Here is Kelda being awesome when Norse-thugs hassle her beloved.
( Go Kelda! )And here she is when the Siege interrupts her bereavement call on the House of Bills.
( I know, now. )I hope we get to see more of Kelda (and Valhalla Bill) even now that JMS and Co. are off the book...
ETA: Is there a series name and/or tag for this Week?