No, you're not crazy! As a matter of fact, just last week there was some geomagnetic activity that could have added enough extra energy to the atmosphere to help the spirit manifest itself and create activity.
Since you've had several occurrences in such a short amount of time, I would think there is a strong possibility you will have something else happen. It may be related to the death in the house, but it could be something else entirely. Sometimes it's really hard to say what starts activity and what the root cause is. You didn't mention how old your step-daughter is, but poltergeist activity is thought to be created by pre-teen to teen females going through puberty and other stresses during this time of their life.
Would you be willing to fill out a questionnaire? It would give us a better idea of what is happening in the home. If not, that's fine too. I could give you some suggestions on how to handle activity if you would prefer that over having a team come out to investigate.
Please feel free to reach me at [email protected]
to discuss your case in more detail.
Take good care,
South Jersey Ghost Research