COULD THIS BE A SIN?

Good day mamas and papas in the house, please I need your advice on how to handle this critical issue. A Christian sister in a certain Church got pregnant, the Church decided to discipline her since she was not married.
When the elders of the Church met her, she told them that she has stayed in the Church for years and no one is marrying her and she is getting to the age were she can't get pregnant if married.
So she went and did artificial insemination since she wants a child. She provided the medical documents that showed that she has done the artificial insemination. The Sister is pregnant without committing fornication nor adultery.
Not so? BUT, COULD THIS BE A SIN? If YES or NO. Please, give your reasons for your answer. If possible Back it with Scripture, so dat we can learn.