Constance de Salm: Cimetière du Père-Lachaise #2

'CONSTANCE MARIE

DE THÉIS

PRINCESSE DE SALM DYCK

Décédée le 15 Avril 1845.'

At last I found it, although not without some effort. I suppose it goes without saying that it's not in the very useful Plan du Cimetière du Père-Lachaise you can buy at either of the florists opposite the west and east entrances, but even when you know vaguely where to look the map can still be a little woolly in parts. I've already mentioned Constance de Salm elsewhere, so I'll just leave the link:

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Constance de Salm: Vingt-quatre heures d’une femme sensible