An article on Keller has now emerged on a New Zeeland site:
http://www.bayofplentytimes.co.nz/localsport/storydisplay.cfm?storyid=3787551&thesection=localsport&thesubsection=&thesecondsubsection=
In summary:
She is a former New Zealand champ in table tennis - and, at the age of
43, still competitive, reaching the semifinal stage of the New Zealand
Championships last year.
Given a bad cold and the fact that she had never played a single match
of badminton before the Swiss Open her ending up no.2 in the Elite
Class is remarkable.
In her own words: "Considering I was just having a go in the good old
Kiwi way, it wasn't a bad first attempt."
Apparently, she is planning to take part at the World Champs in
Germany next month.