It's frustrating how little is known about Joy's background. She had lived in the area her entire life, and was never married, but had she been in relationships in the past?
Had she always been involved with the church? Had she taken a personal vow of celibacy? Would she have welcomed some male attention or been horrified by it?
Joy's family said she wouldn't have let someone into the flat, but an adult woman probably wouldn't tell her brother or nephew if she did ever have male visitors, would she?
The state of the flat (with washing on display) and the dressing gown Joy was wearing make me suspect that she wasn't expecting a special visitor at that hour.