The Kelly sisters will reunite next season after Adelaide finalised a three-club trade to bring Niamh’s sister Grace to West Lakes.
The Irishwoman joins the Crows from St Kilda, in exchange for Pick 52 which goes to GWS.
Kelly, 30, is a versatile and exciting utility who can play on the wing, up forward and across half-back.
The sisters played together at West Coast in their first three seasons of AFLW before Niamh was traded to Adelaide and Grace to St Kilda ahead of Season Seven.
They faced off against each other for the first time in their AFLW careers in Week Six this season, where Grace recorded a career-high 21 disposals and five tackles.
“We are thrilled to welcome Grace to the Club, and we are really looking forward to seeing her play and train alongside her sister Niamh next year,” Adelaide Head of Women’s Football Phil Harper said.
“She will inject some speed and excitement into our side and she can play a variety of positions which is great.
“Grace is a quality player and person who we think will complement our team nicely.”