The subject of used washer recommendations is getting tricky because so many appliances these days are not designed to be repaired. rather, they are manufactured in a way that they get sent to scrap as soon as something really major breaks on them. So, the used market isn't as prevalent as it once was unfortunately. I believe that Speed Queen is the main exception to this plastic-fantastic rule, but someone more knowledgeable than me can certainly chime in if I am off base in any way.
I do believe that the Whirlpool-built direct drive platform (the Roper above belongs to this group) is still a good choice for a used washer, but be aware that the newest of these is now around 13 years of age and will need at least some minor going over. I learned my lesson about that last year when I bought a direct drive Whirlpool washer from a used appliance dealer here in town. The machine was made in 2005 and I thought that since it came from a storefront type of situation it would be completely in working order, and the thing is, it mostly was but there were minor issues with it that became major difficulties over a few months. I wound up having several components replaced on it and the machine runs very well now, but my point is just to expect to do some work or hire someone to have it done if you buy one of these machines. It's very likely it won't be ready to jump into service as is if you want any longevity out of it.
I hope this is helpful to you and I wish you and your sister luck.
Ryne