I'm not sure if the issue here is that your relative needs these high fibre snack bars and nothing else will do, or if she just needs fibre. If it's the former, than pack up the bags with her bars, because she might not like the Italian options (which she will find).
If it's the later, this is what I've done in the past: I buy Kellog's Bran Buds (or something just like it--the package shows what you're getting) and mix it with yogourt, also easily available in many flavours. I sometimes bring the bran from home in a ziplock bag -- it's light. Next trip I'll probably bring some Benefibre in powder or pills. I can dissolve the powder in any liquid or stir it into food.
Hope that helps. Fibre is important!