Why not try to organize a "gear lending" program. If their youngest is 7, and was a rough pregnancy, she likely won't be having a 5th. Would she really need a ton of gear for super long?
I mean, a swing will last a few months. A stroller maybe a year or so. A bassinet - weeks/months. I'd be happy to lend a lot of my gear (and did) with the knowledge that I'd be getting it back. And, if this is likely her last child, why would she really want all new stuff again - only to get rid of it within a year or two (at most)?
If other friends have younger kids who aren't using something, why not get on a lending program? Or, if they are done with it - give it up? Rather than spend $$$ on new items, reuse/recycle things that are still by all means likely in good to great condition.
Things like the stroller, crib, high chair - stuff she'll use for longer periods of time - then her family/very close friends could chip in and buy her something new.