For me personally, if I was still having the obstructions, I would be afraid of eating something that might get "stuck". As it stands right now for me, even though I do have the all clear to eat normally, I am still playing it safe for the most part. I have tried some non low fiber things, but only in a very small amount to see how I do. The anxiety I would have if I overdid it is just not with it in my opinion.
I hope your mom gets some answers and gets to feeling better!