LOL. Maybe Google's version would work better. My sister has "Alexa" and for the most part it works and is kinda cool. Probably works better in a quiet room. Alexa times the roast and puts on playlists and answers questions like Siri. We have decided she has a better voice than Siri, but no sense of humor.
MY sister also got the fire TV, which is voice controlled also
My Echo works pretty well. I do not have to be in a quiet room for good recognition. I have it in the kitchen and it will perform my commands with the TV on right next to it. I can also be in the family room next to the kitchen with the TV on and she will perform the commands from there even when the kitchen TV is on, too.
I obviously can't imagine how loud the noise must be around your Echo, but with my wife and 2 daughters talking AND the TV on in the kitchen, my echo can hear me in the next room say "Alexa, shuffle playlist, volume 10" They get so mad when I do that.
I thought about getting one when it was offered when first introduced, but didn't jump at the offer. I got mine about a month ago and it seems to be working great.
Has your sister tried checking software updates for it?