Tianna Thomas was arrested Friday and is charged with murder, attempted murder, aggravated assault and other related charges.
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Police said Thomas lived across from the sisters in the Brewerytown neighborhood.
The stabbing happened around 11:30 p.m. on August 19, in the 1500 block of North 29 Street.
Police search for teen suspect, 7 others after sisters stabbed
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Shawntae Garrison, 23, was found lying on the ground with multiple stab wounds, police said. She was taken to the hospital where she later died.
Garrison's sister, 28-year-old Tayshawn Layton, was also stabbed multiple times. She was taken to Temple University Hospital to be treated for her injuries.