Replying to PRE CALLOUT ADVICE NEEDED

ok so i sold my old saga jacket. shipped it out priority mail from salt lake to bozeman. its been 3 weeks and linelover has not recieved the coat. i have never had a problem with selling or buying anything on here. I have been a part of newschoolers since when linelover was in diapers (it looks like from here photos) i did not get tracking or delivery conformation because i felt i was going out of my way sending it priority mail FOR FREE and i in my life have never incountered a shipping problem.

Aparently the jacket did not arrive. To be honest its long gone if it hasnt arrived.

I dont know what to do. She has sent me 5 arrogant messages about me being a scamming douche and she doesnt give a fuck about my feedback because the last one is in 2008 or some bullshit and all i am is a scamming douche who should feel like shit around my grandmother.

what i do have on my side is that linelover sent me a GIFT through paypal. so technically no goods are exchanged. she sent me a gift, i didnt ship with delivery conformation. who is at fault? what is the solution? do i lose my coat? or does hannah lose her money? do we meet in the middle?