Julie Ann Parry was seriously injured at Bwlchgwyn farm, near Barmouth, last week.
She died of her injuries over the weekend.
The 49-year-old is believed to have been working at a pony trekking centre at the farm and was tending to horses when she was struck by a large hay bale.
Her father Stuart Eves thanked the emergency services for all they did to try and save his daughter’s life.
He told the Daily Post: "The care and compassion they showed to her at the scene and later at the hospital was fantastic. She couldn’t have got better care."
Her organs were transplanted into other seriously ill patients.
Mr Eves added: "The loss of my daughter saved the life of three other people and knowing that means she did not die in vain."
Louise Hughes, a Gwynedd Councillor, said: “Julie was a community councillor for a while, and always very involved with anything going on in Fairbourne.
“She had a smile for everyone and a fantastic sense of humour, and she had a really infectious laugh.
“The whole village is in a complete state of shock, and she really will be genuinely missed.
“It’s a horrible tragedy. She was definitely one of those people who seemed forever young.”
A family friend added: “She was a lovely woman and very kind with a fantastic personality.
"She was very popular. I have known the family since they first moved down here around 40 years ago.
"It’s an awful shock for the village. She worked by helping out with the horses.”
A Health and Safety Executive spokesman added: “HSE is aware of the incident and an inspector has attended the site. We are working with North Wales Police.”