My neighbor's a snitch, what can I do?

This past Sunday my friend/neighbor informed me that she is the informant (snitch) for the property manager. She says she only wants a safe apartment community.However, there are about 36 apartments in this building and in the four years I have lived here I have seen people come and go and I have heard of evictions and angry tenants over nonsensical issues. I can't help but think that my neighbor has been the one to throw them under the proverbial bus. I have been thinking about it all week and because of it, haven't talked to her since. What would you do in this situation? Is there anything that can be done?