Just ran through it. This order works. The first sentence of the last clue was just on the back end of the clue before. I'll update the walkthrough a little later.
I just replayed this and it does not work. Here is what I get:
MC: Clue selected - The killer had a key, or someone with a key gave him or her access (previous two passed)
And you told me yourself there are only two keys you had both at the time of the murder
In other words either you murdered Merek yourself, or let who ever did it inside
Which is it Primrose?
Primrose: 1..! don't...
MC - more details ends with "Why don't you just tell me what happened? Please?"
Primrose: I don't believe you. What evidence could Sammera have to show that?
MC: So it has come down to this, huh? The moment of the crime itself. Very Well. The evidence Sammera has to show you did this personally is this...
(Clue selection appears) Select Truthsayer Merek was poisoned.
Primrose: Is that all? That hardly incriminates me in Merek's murder.
MC: Err...I doesn't? (failure dialogue follows)
Note I play the PC version through Wine on my Mac and other VNs done this way either don't run at all (very very few) or they run just as they were coded for the PC so something is clearly wonked. (I have fiddled with the save file but it shouldn't break things like this as I only gave myself more money and time)
I have had this piece of weirdness happen before when something was wonked with my version of game (The original Alone in the Dark 2) and someone had to send a save file to by pass a glitch in the game I was having.