The shift in Ken's smile... Sumire realizes something awful must have happened involving this Yuki-san he knows.
She's seen that kind of forced smile before. She's done it, herself. Maybe not a lot, but recently, at least. Now that she has people she knows she needs to smile for.
"...I'm sorry... I..."
Ken saying that Sumire must be something special makes her feel worse. After all, Kasumi was surely the one that deserved to be the leader of the Phantom Thieves, and surely she would have had that Wild Card ability if Sumire had it, but... she gave up her life so that Sumire could live.
But she doesn't mention it.
"...Being a Persona user... It isn't easy, is it?"
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She's seen that kind of forced smile before. She's done it, herself. Maybe not a lot, but recently, at least. Now that she has people she knows she needs to smile for.
"...I'm sorry... I..."
Ken saying that Sumire must be something special makes her feel worse. After all, Kasumi was surely the one that deserved to be the leader of the Phantom Thieves, and surely she would have had that Wild Card ability if Sumire had it, but... she gave up her life so that Sumire could live.
But she doesn't mention it.
"...Being a Persona user... It isn't easy, is it?"