Name That Trauma:: Sebastian L. on an Attic Staircase Apparition

Hey there, Kindertrauma!

I have a super obscure Name That Trauma that I'm hoping someone out there might be able to help me with. I remember seeing a commercial on TV, probably sometime in the very late 1990s or very early 2000s. It was for what I am pretty sure was a TV movie (though I suppose it may have been a series) that was most likely airing on one of the big networks (CBS, ABC, NBC, or maybe FOX), as that's primarily what I would've been watching at that time. All I can remember is one scene that showed someone (whether a man or a woman, I don't know) seeing an old woman standing a the foot of what looked like a set of stairs to an attic. I even think they may have seen her in the reflection of a mirror, though I can't be positive. I'm quite sure the commercial framed her as a ghost, because it definitely had a spooky context. It may have been the ghost of the protagonist's mother (at least that's how I remember it, but I may have just assumed that at the time). There was nothing outwardly creepy about the woman herself, it was all context. From what I recall, she had her hair pinned back in a bun or braid or something, and was wearing a dress with long-sleeves. I wish I could remember more, but that's the only image that really stuck with me, and has for almost twenty years. Any tips would be appreciated!

– Sebastian L.