Neighbor complaining about my instrument-part 2

Hey all,

A while back I posted about my neighbor living below my complaining about my harp playing, saying that it really bothered her. She would come to my door to complain and nothing short of my not playing altogether would make her happy.

Trying to settle the argument, I've had the floors in the house insulated with a special type of foam to reduce/erase the sound and the vibrations coming from the harp. I e-mailed the letting agent to inform them of the dispute and if putting in the insulation was okay, and they told me to go ahead and that it had to be a reduction of at least -10Db, so that's what I've used.

I've also adjusted my schedule to playing during the daytime instead of the evening. I usually work between 15:00-2300, so would play before leaving, that way trying to ensure there are fewer people home at that time.

Still, she comes up frequently to complain and at this point I feel like I've tried everything. I've insulated my floor, costing nearly a grand in materials, I've adjusted my schedule, I still put the harp on a thick mat while playing. I've also sought legal advise and they basically said that if I play during daytime she really has no right to complain at all, but this obviously can't go on, but I'm at a loss of what to do next.

I can't move, as rentals are very scarce in this area and would be much, much more expensive than what I'm currently renting. I've checked with the neighbors left and right, they told me they can hear some of what I'm playing, but are not bothered (I have not insulated my walls, just the floor, so they are probably hearing more) and have received no other complaints from other residents.

Harps cannot be fitted with dampers unfortunately, so that's not an option. I practice 45 minutes a day if I can (no more than 5 times a week) depending on schedule and I feel that this is not excessive and I do need the practice. Does anyone know what else I can do?