Sally is quite upset at Bridget's and Danny's relationship.
Bridget was Sally's bestfriend and as she begins to date Sally's ex finace Danny, she begins to sence and even hear the ghost of Sally.
She later learns that Danny was the one that killed Sally, but she believes Danny's lies when he tries to cover it up.
When Bridget starts to get bruises and bumps from Danny treating her harshly, Sally eventually notices and tries to help Bridget but this ends up with her going to see Sally at the house and telling her to stay away from her and Danny.
After Danny is caught out about his lying and the truth is revealed that he did in fact kill Sally, Bridget leaves Danny standing in the house alone and as she is leaving she apologizes to Sally before turning and walking out the door.