Cat behavior problems!? Part two!? PLEASE HELP ME!! EMERGENCY!?

Ok so I posted a a post about 7 hours ago about my cat Ami hissing and growling at my other cat Lucky. Lucky had gotten out 2 days ago and didn't comeback till the next day. Ever since then my cat Ami has been hissing and growling at her. Well now, Ami just swatted violently at Lucky. Luckily I was there and snatched Lucky away right before Ami got to her. But she is starting to get angrier and angrier. I don't know what to do. I was holding Ami and petting her and scratching her tummy and she just started growling and she kept trying to bite me. I need help fast! Please help me!