Why was Sal's mom in Idaho?

Do you mean Sal, from Walk Two Moons?

Well, I think the father moves there because he wants to find the mother. Since the mother moved away because she wanted to be alone, to clear her mind. She's jealous of the Hiddles (Sal and her dad).

I wouldn't want to spoil the WHOLE story for you. So I'll just give you this.

Okay, the author is SHARON CREECH. Buy her books online. Walk Two Moons.I hope this answers your question.