SENSING YOUR CHARACTER: This is fine. Silvia has no innate ability to conceal her presence and the only exceptions would be situational/event related.
REMEMBERING & IDENTIFYING: Also fine.
TRACKING: Likewise.
IDENTIFICATIONS: Not being super familiar with Tobirama I'm not sure if this applies- but how is he about sensing things from magical artifacts? Because Silvia has one. The Ocular Talisman is an ornate handchain she keeps with her that has been known to even give non-magical persons the creeps when gazing upon it. As for herself specifically, she did acquire some new abilities via events in game, so he could likely sense the not fully realized potential. I'd also be fine if he could tell that her soul has been reincarnated. Not much is off the table here. We can work something out /o/