Bindemann of Prussia?

I've received an 1870 Pancras, London marriage cert for Louisa
Elizabeth CROUCH b.1841 East Stonehouse (Plymouth) Devon. I'd like to
find out what became of her. The groom was Ferdinand Dietrich Wilhelm
Christoph BINDEMANN, Professor of Music. His father is given as Johann
Christian Bindemann, hatter, deceased. No further details.

I can't find any further trace of the couple in British records. She
was one of four surviving Crouch sisters. One of them is later
described as having moved to live in Russia or Prussia (accounts vary
and it does make rather a difference!). I can narrow that down to
either Louisa or one other sister - I've already tracked down the
others. Bindemann in British census and IGI records commonly seems to
be of Prussian origin - so it seems *promising* that Louisa may be the
sister in question and Prussia the destination.

Given I've so little to go on, is there any simple way I can check
whether Louisa or her husband are in any Prussian/German records? Any
advice is welcome.
-- 
Phil C.