Yes, shifting!! This is hypothetical and crazy BUT...What if the ransom scheme is a secret diversional ploy by LE to flush out the real perp? Like maybe LE thinks it IS a fam member who has done this for financial gain/insurance, etc. and this phony ransom scheme was thrown in to flush them out. Maybe they're (the perp) getting a little twitchy worrying if the sibs use any of NG's money/assets toward paying a fake ransom scheme then there won't be any money left to really collect from her estate after they find her deceased?
Sounds outlandish ofc and this would be door #5 in reality lol but this entire situation is just

so anything is possible at this point! Praying NG is still alive and in a hotel/motel room somewhere and they give up her location when they receive the bitcoin!