Aditi finished with a round of 74 and ended at five-over and in tied-21st place, which is where she was placed overnight.
Aditi had a colourful round with five birdies, five bogeys and three pars and then she finished with a run of four pars and a double.
The T-21 is Aditi's best finish as a pro on the LET tour.
Rookie professional Nuria Iturrios from Spain won the Lalla Meryem Cup in only her second start on the Ladies European Tour.
Parker, who played with Iturrios in the final round, had 17 straight pars and a bogey on 18 in a 73 to finish second on five-under-par. Yin finished in solo third place a stroke further back after a final round of 70.
Finland's Noora Tamminen was outright fourth on two under par and Switzerland's Albane Valezuela was the leading amateur in a tie for fifth with Emily Kristine Pedersen and Isabelle Boineau.