Not honoring Purchase Option in Sales Agreement - Need HELP!!!!!!

[William Glass]

Hi BP,

I'm trying to help my mother out who had land in Sedona Arizona for 10+ years and had to sell in 2009. They sold it to their neighbor with a clause that gave my mom the option to purchase the land at fair market value prior to any other buyer. 

Well she just received a call that the neighbor is selling but won't sell the land separately from the house because the land, if built on would potentially block the neighbor's view. She was told they are not selling them separately and could make an offer on both. 

It appears that they agreed to terms via email, but the actual language in the sales contract of the land in 2009 says "(my mom) reserves the right to purchase this property back from the Buyer. Terms and conditions of said purchase shall be determined by the parties outside close of escrow. "

Does anyone have any experience with something similar and/or can someone recommend an Arizona Real Estate Attorney who can advise?

This parcel is sentimental to her (as I've already suggested we find a better parcel).

Thanks!

William