My girlfriend has been saying that there are ghosts in the window for the past two nights, and she is still calling her.

Did she have any dead friends or relatives? Or recently watched the hit "Soul Ferry"? Are you healthy? Have you ever had a similar situation before? I suggest you take her to see a psychiatrist. If there has been a similar situation before, you can look for a nearby witch. Usually, local methods are also very effective. However, if there are too many liars, you'd better ask your family. It may be possessed by a ghost. She is a soft-hearted person, so pay attention.