How about a digital recording device like this? Portable to keep on you so you can record calls even when not at home.
"Can you say that a little louder? I need it for my notes." Places digital recorder on the desk.
I don't think Echo devices are really suitable for making/playing voice recordings.
She might be better off with a simple handheld voice recorder; here's an example:
https://www.amazon.com/Recorder-Activated-Lectures-Interviews-Dictaphone/dp/B07P9823YX
It has simple controls which shouldn't be hard to operate by touch.
Well it's possible it's an auditory hallucination. I can get those too when I have a headache (though rare). Also sometimes people can just get random auditory hallucinations for no reason and so long as it's not a regular occurance I wouldn't be too concerned.
However what could be fun is next time you're over there bring a little audio recorder with you. Just leave it on while you wander around the barn and just talk to yourself to see if you can get a ghostie to answer back on the recording. I use this one when I'm out on paranormal investigations.
There’s an actual recorder you can get off of Amazon that’s not a cellphone