Is $30,000 worth a 9 year book of a hair salon? I have yet to see the profit and loss (which I will be seeing when I sit down again with the owner)

Back story she has cancer and will be getting surgery and will not know if she will need chemo or not. I’ve been looking for a bigger space to rent and found this one and in the listing it also stated she is willing to sell her books.

Today she told me she is asking $30,000

My question is, when I look at her books, how much should she be making a year in order to justify $30,000.