Too many words. Rephrase and ask again.

I have had my cat since it was born (its mother is my grandmother's cat). I have another cat from the same litter and an older cat. They all get along well. On Sunday my cat was sitting under the kitchen table and my neighbor came in. As soon as she came in my cat reached out and scratched her leg. This lady left and continued her conversation with my mother outside. When my mother tried to come in however the cat began moaning and hissing at her. This behavior continued thru the evening, with her growling and hissing at the other cats and both me and my mother. As it got later she became more aggressive, chasing the other cats away and running around peeing everywhere we went. Frustrated, my mother tried to get her to go outside but she hid behind the couch and pooped. Finally we got her outside. Around 5 in the morning she came to my window and meowed. Thinking she was back to normal, I approached the window and instantly she began howling and hissing at me. She ran away and that was the last I saw of her till morning, and she seemed back to normal. However last night she began hissing and growling again but it seemed only directed toward me. We have not had any conflicts or out of the ordinary events in the last few days. The only events for the weekend were my neighbor coming over; however she has been at her house many times before, and the cats usually pay no attention to her, and a little bit of cleaning. I'm confused by my normally peaceful cats’ sudden aggressive behavior, especially toward me.