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Cassie works well as a sister name for Kelly. Cassandra "Cassie" works, but I think that just Cassie would work even better.

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Kelly and Grace "Gracie" seem like completely different styles to me, but Cassandra Grace or Cassie Grace would fit with Kelly Catherine.

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Sister names:
Amanda
Samantha
Danielle
Erin - Maybe Erin Grace?
Natalie
Sabrina
Sasha
Lindsay / Lindsey
Courtney
Erica
Heather
Amy
April
Stephanie
Jillian / Gillian
Rebecca
Rachel
Sarah / Sara
Amber
Alexandra
Melissa
Brooke
Bethany
Megan / Meghan
Valerie
Sierra
Kirsten
Kristen
Krista / Christa
Christy / Kristy
Christine
Christina / Kristina
Summer
Tara
Tammy
Aubrey
Jocelyn
Vanessa
Alyssa