Group of teens get trapped in their car during a snowstorm and have to take shelter in a manor home

[Avamazing]

Ya Mystery/romance Female main character and her boyfriend, best friend and her boyfriend all camp out in this old manor home that they think is haunted but in the end we find out that someone was just living in the attic
they find a diary from a girl who used to live there and read about how she loves her maid more than her family and how someone was poisoned
Not sure if it was the 60s but it's definitely an old book
Thank you!

[Hannah]

I know that book. I used to own it. They were coming home from a music competition? And the MC's parents are realtors so she knows of the house a litte?

[Hannah]

The Ghost of Graydon Place, Dorothy Brenner Francis?

[bookel]

https://openlibrary.org/books/OL24960...
Keywords there:
music contest, journal, attic, car, supposed to be haunted, snowstorm.
Nanny. Our cook and housekeeper.

Page 61
“She must have eaten something that made her sick,” said Tracy. “Or perhaps she had a heart attack. Sometimes young people do have attacks.”

Keywords not found:
maid, poisoned

Sounds like the book.

[Rainbowheart]

The Ghost of Graydon Place for the link to Hannah's suggestion.