<span class="searchmatch">lū̆ctae</span> inflection of lū̆cta: nominative/vocative plural genitive/dative singular...
stronger evidence of it being short. See notes at lū̆ctor. lū̆cta f (genitive <span class="searchmatch">lū̆ctae</span>); first declension (Late Latin) a wrestling, wrestling match (Late Latin)...
nominative lūctus lūcta lūctum lūctī <span class="searchmatch">lūctae</span> lūcta genitive lūctī <span class="searchmatch">lūctae</span> lūctī lūctōrum lūctārum lūctōrum dative lūctō <span class="searchmatch">lūctae</span> lūctō lūctīs accusative lūctum...