the granny with the trading wagon will show up every weekend so just check the field area every morning, its the large empty area you can go to if you keep going left after leaving the houses front door.
Iif you dont understand i could hop on the game and send a screenshot showing where :>
id completely forgotten about this, ill get some sleep and then ill do it after i wake up ok, if I forget again then send another message or something to get my attention