Diksha, who seemed to show a return to form with a fine 70 in the second round, slipped in the third and final round once again.
She totalled 13-over 226 with rounds of 76, 70 and 79.
Astha Madan, the other Indian in the field, missed the cut with rounds of 77 and 75.
England's Annabel Dimmock rounded off the week with 68 after rounds of 69 and 69 in first two rounds.
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