Dear Zoe
I’m sorry to hear of this difficulty. I checked and it is important to do the following:

• Recite Vajra Claws every day. Of course, it is better to do this privately in Geshe-la's room or somewhere where it can be seen by our friend.
• Recite the Diamond Cutter Sutra 60 times.
• Key staff should wear a protection, especially you (Gyaltsen Tsemoi Pungyen).

Start with these things and I will see if there is anything else. I am going to do a puja now and will include this situation.