We bought our three bedroom flat last year, as its in a lovely part of town, close to beach, station etc. It was built in 1920s, no sound proofing but purpose built. I hadn't realised how loose upstairs floorboards were on viewing the property. Our upstairs neighbour was difficult before we moved in but masked it as wanting the i's and t's crossed. She has now accused us of harassment because we asked her during a conversation to screw down her noisy floorboards, she wakes us every night when she gets up, so no decent length of sleep and they're so noisy in her lounge. She emailed us to say she had plans in place for floorboards and then said we were intimidating her etc which was not the case. Would sound proofing help? I don't want to involve solicitors and I don't think they can do anything anyway. She refuses to speak to us and we can now see her pre moving in behaviour was an attempt to keep us away as she's always had elderly residents beneath. Any advice gratefully received!