Help needed for dual monitors

First, you make a roux...

What kind of computer is she using at home?

I would consider buying a dual monitor stand that clamps onto the desk/work table. It gives better adjustment for working.
I don't suggest stands that sit on the table top because they can tip easily if you move the monitors forward.
I bought 2 Dell 27" monitors 3 years ago and they were quite reasonable compared to others at that time. Not sure if they were replacing them with a newer model.

What kind of laptop? What connections does said laptop have available?

Get an ultrawide instead

Make sure the dock she uses has multiple video options and supports dual monitors. I don't recall ever seeing.one that doesn't, but just as soon as I say something you'll find one. It's pretty much plug and play, then setting how you want the monitors to behave (mirror, extend, duplicate, etc.) If you want to just make one massive work area, just choose "extend display" in the display options of your OS.