I think she is only sensing that because it is directly related to her parent’s death. It’s also a Sith artifact, infused with the dark side. Anakin’s lightsaber is just that - a lightsaber. Even if it has been used to do evil deeds in the past, it wasn’t created with that express purpose.
We’ve already gone over the parent stuff. Bad idea to remove that. We need them to care about her so that she is angry at grandpa Palps.