It will be held on Tuesday afternoon with a private, family-only service.
The 18-year-old student was the only one of five passengers in a silver Ford Fiesta that crashed on Friday, February 5 to die in the accident.
Four other people in the vehicle were injured, two of them seriously.
The car was travelling along The Mead towards the roundabout junction on the A350, near Lidl, when the accident happened.
It hit a kerb and is understood to have bounced off that before smashing into a brick garden wall and a tree.
Police said the 19-year male driver who was taken to Southmead Hospital in Bristol, along with an 18-year-old girl who was also seriously injured, has since been released from hospital.
A 19-year-old woman and a 19-year-old man, both local, have been arrested on suspicion of causing death by dangerous driving. Both have since been released under investigation.
Police added: “We have no significant updates in our investigation.”
Beth’s family have arranged for the funeral cortege to drive down Haynes Road at approximately 11.45am to allow people to pay their respects. It will proceed along Station Road before leaving Westbury via The Ham.
The support of the community has meant so much to Beth’s family and if members of the public wish to pay their final respects as the cortege drives past, they’ve asked people to wear bright colours.
The family, along with Wiltshire Police, also urge people to ensure they are adhering to social distancing, wearing a mask and not gathering in groups outside of their household or support bubble.
If anyone would like to make donations in Beth's memory, her family have chosen The National Autistic Society.
Inspector Simon Cowdrey, from the Warminster Area Community Policing Team, said: “This has been an incredibly tough time for the family of Beth, her friends and the wider community in Westbury.
“We understand people will want to come together to pay their respects and comfort each other on Tuesday, however, we must remember we are in the midst of a national lockdown.
“The last thing we and Beth’s family want is for this tragedy to be compounded by spreading the virus, so we want to make sure this is done in a safe way, which does not pose a risk to public health.
“Together, with Beth’s family, we would urge everyone - particularly young people in Westbury - to be mindful of social distancing and the current Government restrictions."