Keeping a kitty away

Ok guys..i know i havent been on much..mainly bc i forgot my user name..lol..but i have kind of adopted an outdoors kitty...she is a tiny little thing...gorgeous...deep charcoal grey, beautiful gold eyes..she looks to be no more than 6-8 mnths old...she frequents my porch....i already have my 3 babies indoors...and i cant adopt anymore due to my apartment complex rules..but this little thing looked soo pitiful i feed her..and she keeps coming bk...now the issue is my female cat hates other cats..she can barely tolerate my 2 boys..but everytime this cat approaches the porch she goes into full attack mode..we are on the first floor..and she comes up to the sliding glass door..and all of my 3 cats sit looking out the door..but when the kitten comes around..Jazz (my female) flips out...starts screeching..and bc she cant get to the kitten..she attacks my 2 boys...so i need to find something i can put around the border of my porch ..to keep this little on off of it....i think i saw something about red pepper flakes or tabasco...will this help..i dont want to hurt her bc she is beautiful...and i dont know if she belongs to anyone in my complex..but i cant keep separating Jazz at night so she wont flip and hurt one of my boys...anyone???

 

can you ask around the complex to see if she does belong to anyone? If you do find the owner you might want to just offhandedly ask if she was spayed - if not she might come into heat soon and be a kitten having a kitten!
if you don't find her owner I'd get her into a no-kill shelter so she doesn't become a kitten becoming a mother and then you got tons of cats hanging around.