i would suggest you to put a CCTV (preferrably if hidden) outside your house that able to take the entire video of what's happening at outside the gate.
true, you're wasting your money, but i believe you will gain what you want. I know you're not purposely want to launch personal attack to that aunty but she's just way too much. this is being completely selfish and irrational.

you got all the picture, take some video, 1 shot, kao tim her, ensure she either shift out from that house or choose to shut the f*** up.

it's not being harsh to an old citizen. regardless old or young citizen, we all must learn to respect and not acting like her. she thought she's old citizen and everyone must obey her? she should get a life.