Dearest Siegswife... may you have peace!
As a Property Supervisor with a great deal of experience, may I offer you some advice on this, please? Thank you!
First, do not call either the office manager... or the police. Neither can... or will... do anything. Although a threat has been made, the police cannot act unless a crime has been committed. They will tell you that the only recourse you have at this point is to file a civil suit for harassment. However, you have not actually BEEN harassed, so I don't think you will find a judge that will take it. Your only knowledge is based on hearsay, what the maintenance man said, which "Pammy" can deny. It's her word... against his.
Please note that your landlord is NOT the police. While their job is to see that you are provided with safe housing, that has to do with electrical, plumbing and other hazardous issues. It is NOT his/her job to protect you. Thus, they... will tell you to file a complaint with the police. Which leads you back to my statement above. (You can file a written complaint with your landlord, but all he/she can do is put it in the file, for now. He/she might write a letter to "Pammy", but that just might aggravate her further, yes?)
May I suggest that you call your local County Department of Mental Health? You can even call Adult Protective Services if your County has it. Either of these agencies should have a hotline or social service/counseling referral number. Call them and tell them what you have stated here. Leave nothing out. Tell them that you are afraid that Pammy might not only do harm to you and/or your husband... but to herself, as well. Make sure that you EMPHASIZE that you do NOT want the source (you) of the call revealed to her, as you are fearful of repercussion. SiegsWife, these people are TRAINED and QUALIFIED to handle folks such as dear Pammy; however, your landlord and the police are NOT. The police might even see/treat her as a criminal. If she is mentally ill, however, she is NOT evil... NOT a criminal... but ill. Sick. And she should be treated as such. It is what you would want for yourself or your loved one were the tables turned. Your landlord will see her as a nuisance, sure, but as long as she pays her rent and doesn't cause TOO much trouble, she is not their problem.
Or... you can take your own advice and that of the others here. But I don't think that will solve your problem... or help Pammy.
Your servant and a slave of Christ,
SJ (on my own a little bit, but keeping the will of my Lord in mind...)