Originally Posted By: olly
Kia ora Coffebean,
Words that spring to mind are, former, erstwhile, past, previous/prior (depending on current marital status)

Olly, erstwhile looks to me like a half German, half English word. If we would take the whole in German things would be easy:
'with her damalige Gemahl '.

But I think as English has no specific word for it, to me 'with her then husband' sounds fine.