I probably wouldn't have bought the 50 dollars one, but I do have the more expensive brother from walmart that i love, I would just feel that for 50 dollars the machine probably doesn't have many features and she might out grow it really quickly as opposed to the 139 dollar one. I would sit down with SIL/MIL and ask why they didn't want to get a nicer machine that she can grow into instead of buying something they might be replacing later. Chances are they don't know much about sewing machines or why you want to buy her that model