make life easier for your mother
I wouldn't recommend any european made dishwasher for your mother as I know of none that have a self-cleaning filter and hard food disposer (although there could be some out there that I don't know of).
If you want your mom to have true direct from table loading capability, I would choose a Whirlpool first followed by a Maytag. They seem to be able to gobble up most anything.
If you get one that doesn't have a built in disposal your mom with have to wash her dishes before she washes her dishes, so to speak. If you don't, you end up with food wastes in the bottom of the machine. This means everydrop of wash and even final rinse water is being filtered through garbage. She will also have to pull the filter out by hand and wash it off after each load or let the garbage stay in the machine and putrify.
Energy efficiency of the european dishwashers seems quite good, at first glance. However, when you take into account the water used to wash off the dishes and grind up the wastes in your disposal, before loading the dishes, the efficiency is probably less than U.S. machines.
Why bother with a dishwasher if you have to waste water time and effort by rinsing your dishes. It not truly a dishwasher then but only a machine that splashes water on dishes.
It seems most european machines are relatively unsophisticated compared to U.S. engineered machines which wash, filter, grind up wastes and dispose of them down the drain
I think your mom might be happier with something where she could load straight from the table. Just pick off large bones and stick the dishes in the machine.
Barry