Is it permissible to intercede on behalf of a woman who displays her adornment (mutabarrijah) in permissible work and in marriage?

The adornment of women in front of non-mahram men is a grave sin. Whoever helps her in a permissible act or assists her in a permissible work will be rewarded, for she has the same rights as any Muslim. However, if her permissible work necessitates committing a forbidden act, such as adornment or seclusion (khalwa), then it seems impermissible to assist her in that, as it would constitute cooperation in sin.