@abctax55 has the best solution,  a cover and referral letter from your friend with an authorization form and SASE to release the tax files to you…

if she’s kept paper files, she might also tell them when and how they can retrieve their tax files (before she leaves town)  if they want to go elsewhere… 

Hopefully she uses the same software as you. If not, intuit should be able to convert whatever electronic files to your platform… good luck