I hate misunderstandings like this. I just feel it's so unnecessary when she could just ask why he had de silver plate. These scenarios always feel like lazy writting to me...
While I'd agree with you in most cases, in this case it makes sense that she hesitated.
She has no clue who killed her family. And then the only clue she finds is connected to Rias.
If she just went to him imidiately and asked him THAT would be super dumb. Because worst case scenario would be he has indeed been just acting and really was connected to her family's death in some way. Then he knows she found out and would kill her.
Of course we, as reader, know that's not true. But lippe doesn't know. Love can make one blind to the darker side of a person. ╮( ̄▽ ̄)╭
I don't know what I was expecting but in this last chapter it felt like something was missing.
For me it's the fact that I was expecting a more dramatic and tearful meeting between Tia and her family.
Like c'mon, she's the family princess. I wanted the grandpa, the cousins and the das have more interaction with her after being rescued in the landslide accident.
You know in the novel this arc has more impact to readers. It's not well depicted in the manhwa.