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I believe there is a certain difference: going to the grave means she would have accepted her father's death already.
It isn't like Touka is dragging Rikka to visit the grave, but reminding her about that matter surely is a way to make sure she doesn't forget, but that doesn't mean she will accept it. Should Rikka visit their father's grave though, it would be a major step forward and done on her own.
On the contrary, letting her visiting the old house would have the opposite effect: as shown in this episode, Rikka still thinks (or tries to believe?) that her father is alive, and by extention, their house is still there.
Confronting the harsh reality while not ready to accept it would just lead to another conflict and denial, which can potentially scar her even more.
The former requires Rikka to have accepted what happened already, the latter would just be even more painful since she didn't accept that.
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