literally: your devil-bride-shrinking violet. but actually it doesnt make sense, because "devil-bride" is someone who's really attractive, but also devilish in some way, and "shrinking violet" is a very shy person....
I dont think so... Perhaps, it just means, that the person this text is addressed to, appears very shy and unsure of herself in public, but when you really get to know her (I guess its a "she"...), you suddenly discover totally unknown features. That's only my interpretation of course...