"...the inciting incident for her to look for the murderer of the current victim, who also murdered her mother..."
I personally find the mother's murder far more interesting and compelling as an inciting incident than finding new and similar clues.
Ask yourself this; what would matter most for the MC, her mother or a stranger? I promise you that the sudden and unexpected death of a parent is by far one of the more significant events in a young person's life.
When you pin this event up as the backdrop to finding new and similar clues in a modern crime scene the later comes across as weak.
More so the psychology involved in the subject matter would make it conceivable that this is not the first time the MC "chooses" to see similarities between her mother's murder and another person's.
It begs the question; Is there a genuine connection between the two murders or are her personal feelings influencing her judgment?
I'm not saying this is the case but because of the circumstances there is an element of doubt.
Good inciting incident leave no doubt and propel the character to take action.