Mentioning cryonics to a dying person

My pa­ter­nal grand­mother is dy­ing of can­cer (not brain can­cer). She is still rel­a­tively healthy, and is tak­ing chemo, but there is lit­tle hope of re­mis­sion (and even if that does hap­pen, she’ll prob­a­bly die of heart failure fairly soon). Her cur­rent plan is to be cre­mated and have the ashes buried in a grave­yard (in my opinion, the worst of both of the “stan­dard” ap­proaches, but that’s not the point of this post).

I would pre­fer if she were cry­op­re­served, but am un­sure how to even be­gin to broach the sub­ject. I also have no idea how to con­vince her. She is not par­tic­u­larly re­li­gious, but is con­cerned with leav­ing as much money for my grand­father (and later my par­ents and me) as pos­si­ble. I have pre­vi­ously dis­cussed cry­on­ics with my par­ents; my father brushed off the idea and my mom looked into it but dis­missed the idea be­cause the fu­ture isn’t likely to want her (I find this ar­gu­ment ridicu­lous on sev­eral grounds). This means that I can’t count on them to help talk to my grand­mother. I may be able to talk to my grand­father first, but this would prob­a­bly not be much of an as­set: he is into sev­eral differ­ent con­spir­acy the­o­ries (the most re­cent ones cen­ter around the world se­cretly be­ing con­trol­led by the “elites” who use the U.S. Pres­i­dent, U.K. Prime Minister, etc. as figu­ra­tive pup­pets), but my grand­mother doesn’t seem to be­lieve these and prob­a­bly wouldn’t listen much to his talk of cry­on­ics ei­ther.

Any sug­ges­tions of how to broach the topic or con­vince her once the topic is broached would be ap­pre­ci­ated. I am cur­rently at my grand­par­ents’ house, but am leav­ing less than a day af­ter post­ing this (most of which will be spent at the lo­cal night­time, and thus asleep). I would pre­fer not to up­set her, both for ob­vi­ous rea­sons and be­cause I may not be able to bring my­self to bring it up on the day we de­part if it will cause us to leave on a bad note.