First I live in a small apartment community..We're only 24 units. And I have a particular neighbor who's seemed to have wormed her way into everything. She knows about every new tenant-including bacnk account standings and credit information. She's in the position where if a tenant upsets her in anyway-you're being evicted shortly there after..
Now, my landlord is going to give her a master key to every apartment here. Is this even legal? She doesn't work for my landlord in anyway..I've already read through my lease which didn't indicate that a neighbor could enter my apartment whenever she wanted.

I can understand that this is a frustrating situation for you. I would suggest that you speak with an attorney regarding this and have him or her go over your lease and discuss your legal options. Some do offer free consultations. You can locate an attorney through the attorney locator on Lawinfo's home page at http://www.lawinfo.com/.