Why not have your own private little service for your friend in your own home? Your friends family obviously has a problem with you. Whether their feelings towards you are deserved or not, they do not want you around. I understand she was your friend and you miss her. The grief her family is going through, though, is unimaginable. Please, do not do anything that could potentially exacerbate their pain. BTW, pretty much anything you do at this point that, other than leaving them alone, could exacerbate their pain. The last thing YOU need is a problem with a next door neighbor who is a cop.
And speaking of you, whether some of the events of the last couple of months are confabulated, or totally accurate, you obviously have more than anyone could handle alone on your plate. Perhaps you should consider getting a thorough medical check-up and maybe a little counseling. Also, if the girl scouts are still selling cookies, I have personally found both the thin mints and the samoas quite therapeutic. 