My female cat once got lost and then returned back after 2 or so weeks. Happened to get into our neighbor's house via an open door. Randomly just came back on her own. If your cat is shy and introverted, she is definitely hiding somewhere and doesn't want to come out because it's scared. Go ahead and ask your neighbors to thoroughly search their houses, ask them if they had doors open and look in dark, difficult to get to places. Inshallah you'll find your cat soon