Some people steal because they are kleptomaniac, not because they have something they need. As for the utility bill, she couldn't have forgotten it unless the excitement over the potential money she'll get after three months blurred her memory. She's also quite old and brain fogs happen to women at that age. It's unlikely but not entirely impossible.
I have seen some spoilers on FB and I saw people getting mad. I wanted to know before I continue coz I hate for villains to succeed. Thank you for answering.