Poster has a good question; how many people can survive 7 days without water?
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Rule of threes - 3 minutes without oxygen, 3 days without water and 3 weeks without food. I’m sure there are some variations, but 7 days seems beyond any exception. She may have survived 7 days if the miralax was dissolved in the recommended 8 ounces of water and she drank it. Even an IV solution might have some amount of saline. It’s hard to say without having more details about her treatment.
Apparently that’s 3.5 years on a cup of cooked rice a day because that’s about what Granddad had during his stint as “Guest of the Japanese Emperor” and he was 84 pounds at liberation.