Dear Amphibian, other than Jaybo's advise above, I can suggest she change ONLY the speakers. For a smaller sized model.
Depending on how small the new space is (how small is it, btw??), these speakers could be a respectably "wide range" / fullish sound floor-standers or smaller, stand-mounted, with the addition of two subwoofer modules.
Considering the ground rules you gave, it does NOT make financial or sonic sense to get rid of the present system; a commensurate replacement today (the "2009 system") would be extremely costly (Goldmund, FM acoustics, Soulution, come to mind). Her equipment, spekaers apart, does not take up too much space, no less than most contemporary stuff (fm acoustics being a notable exception).
Depending on how small the new space is (how small is it, btw??), these speakers could be a respectably "wide range" / fullish sound floor-standers or smaller, stand-mounted, with the addition of two subwoofer modules.
Considering the ground rules you gave, it does NOT make financial or sonic sense to get rid of the present system; a commensurate replacement today (the "2009 system") would be extremely costly (Goldmund, FM acoustics, Soulution, come to mind). Her equipment, spekaers apart, does not take up too much space, no less than most contemporary stuff (fm acoustics being a notable exception).