The family of a university graduate brutally murdered and found in a burning car said she was "an amazing, special person".
Catherine Wells-Burr, 23, was discovered in her red Ford Focus, which was abandoned in a field by the side of a road near Ilminster, Somerset.
A 32-year-old woman was arrested last night on suspicion of murder and currently remains in police custody.
Two men also arrested have been eliminated from the inquiry, Avon and Somerset Police said.
The Bath Spa University graduate leaves her mother Jayne, father Phil, sister Leanne, and boyfriend Rafal Nowak.
In a statement they said: "We have lost our beautiful Catherine; she was full of character, she was caring, loving, and had a bubbly personality. She had a wonderful sense of humour, and was an amazing, special person.
"Catherine had achieved so much in her short life and had worked so hard to gain her Bachelor of Honours in Business Management, gaining a 1st class degree from Bath Spa University.
"She was so happy starting her life with Rafal and excited about their future together. We would like to express thanks for all the messages of sympathy and support, we have found some comfort in all the kind and thoughtful words that have been said about Catherine and in knowing how well she was loved.
"We have found this hard to understand why someone would have done this to her.
"There are no words to express how we feel about what has happened to her early on Wednesday morning. We desperately need to know why. She will be sadly missed. If anyone has any information, no matter how small, please contact the Police incident room on 101 at Taunton."