One resident said: "To be stabbed to death for simply asking someone to turn down the music at a house party is shocking and awful.
"You would think that any decent person would have apologised and abided by the request, especially at two in the morning.
"She did such a good job with her son as he suffers from severe learning difficulties - she was totally dedicated to him. Everyone is in total shock over this tragic death.'
Miss Jones was popular in the village a few miles from Carnarvon, and dozens of friends and residents have posted tributes online.
One said: 'You are loved so much. I feel like a part of my soul has gone. You touched so many hearts. You were always there for many of us.'
The incident happened in the early hours of Saturday. Annoyed at being kept awake, Miss Jones went over to the flats and asked revellers to turn down the music.
A resident said: 'There was an almighty row. When the ambulance got to the flat there was nothing paramedics could do.'
Miss Jones's son is believed to have been staying with his grandparents, who live nearby. The death came as Penygroes was due to hold a Christmas fair, with preparations for the community event filmed for the Welsh language channel S4C.
Elwyn Jones Griffith, a councillor, said: 'The whole village is in shock. Nothing like this has happened before.'
Resident Jean Owen added: 'It's a terrible thing to happen in a village like this.
'We know the families, we know the grandparents, both sides of the families. It's terrible that such a thing can happen.'
Mrs Owen described Miss Jones as 'a lovely young lady'.
Yesterday North Wales Police said in a statement: 'The police have trained family liaison officers supporting the family of the deceased.
'Police can now confirm that Emma died as a result of a stab wound she received.'
Last night a 23-year-old woman from the nearby village of Llanllyfni was charged with murder. She was due to appear before magistrates at Carnarvon today.
Police said a man and woman had been released on bail without charge.