It makes perfectly good sense and adds proof to it being murder and not an accident. It gives her motive.
If you are working that much and what little time you have at home is disturbed over-reaction is normal. I’ve worked 13 hour shifts with a 1.5 hour commute each way. Hearing loud music, stomping, or my neighbors extra curricular activities at midnight made my want to punch them in the face. As a normal human being I delt with it. But it pushes some people over the edge.
The ID channel has a whole series about neighbors who have killed someone over something as petty as loud music. I think it’s called Fear Thy Neighbor or something like that. Not too long ago a judge got shot by his neighbor over a yard dispute.