Not sure what your question is. You can't really make strong, predictable assumptions about how anyone else will act, especially in situations where they are under strain and heavily medicated. What I would remember, forget, and explain in the circumstances you describe is meaningless if I just type it out now from my nice safe home.
When you leave people waiting a year under terrible strain, then conduct a dawn raid and handcuff them and take them down to the station, you are obviously going to get someone stressed and confused in for questioning.
I've seen that justified on the basis that suspects may give away something vital, but it's pretty clumsy psychology. It's like the pragmatic argument against torture - it won't actually get you high quality information. In this case, it throws up noise. Did she lie? Forget? Hoard? Neglect?
Before going too much down the rabbit hole, you need to consider whether it matters. Does the fact that she has lots of handover sheets mean that she murdered anyone? Clearly not. Why does it all matter, then? Did they search anyone else's house for handover sheets? I can't really understand why people think it's important