[Coda]

All three of those can be connected to your modem via an Ethernet cable and may present a better signal than the built-in router. You might consider configuring the two routers differently at that point so that you can configure one to work better with your mom's computer and the other to work better with your own.

I mean, you should try to see how long of a cable you can route to get the second router closer to where you want to use it. Even a few feet can make a difference.

As for which one I'd choose... the first one has GREAT reviews, but it also looks the most like a router so it might be a harder sell to your mom. The other two look roughly equivalent, but the D-Link looks slightly more reliable if you compare off-site reviews.