The min-van right? If she wants space inside, it's kind of hard to beat the vans these days! I'd say do two things:
1st, drive them both to see if either is a big winner over the other in just how it feels to drive and be inside and use it.
2nd, take a measuring tape and compare them side by side, literally. Get one, or yours, next to the van, put the seats up, compare cargo, puts seats all down... how are they then? etc. The slick design of the lr3 or lr4 seats is how they are all 7 up, then in about 4 minutes, all 5 rear are flat down into the floor. Can't do that in the van but how quickly could the van seats just be removed entirely? They might pop out in 10 minutes which would be cool and leave LOTS of space.
Honda though... ick, how about a Toyota van, Mazda 5 is very cool actually, and Mercedes just came out with their "Metris" for the US market. Pretty cool vehicle with huge square opening rear hatch.
As for the "space issue" behind 3rd row in lr3....well, as you know, there's essentially NO space left with all the seats upright. But, it is about as functional as it could be that you can have just 1 3rd row upright, and even just one of 2 of the 2nd row upright with everything else flat. It's very versatile for what space it does have but it will never be as big inside as these people hauling vans.
Here's a crazy idea for you/her: Mercedes Sprinter in the short length as passenger layout. They are available now in 4x4 version and have an efficient diesel engine. Stand up inside, and VERY huge cargo space even with several seats inside. 2015 is the first year for the 4x4 but the rear wheel drive versions have been running here for many years.
How many people does she need to seat anyway ?