i dont think so, only becuz the costume isnt anything similar to her outfit in S1 or anything like Rachel's outfit who is her ancestor from SIV...they both have black, red and yellow outfits...while this girl has red shorts, and a white tee, plus her hair is more pink than red...
is it possible for her to be back? sure, if its before Suikoden 1, but if its after she'll prolly be in Toran since she becomes one of the Six Generals...
Shinjite aisuru hito
Watashi no naka de kimi wa ikiru
Dakara kore kara saki mo zutto
Sayonara nante iwanai
Ano hi kitto futari wa
Ai ni fureta