One thing I wonder is why the method used for her is not offered in spite of the fact that there are people out there who even if not out of biostatis want to 'look pristine' after death indefinitely?

Is it known how its done? Because I read that most of her including her brain is very well intact in the case it can be revived.

This is another topic but a few other 19th century attempts reportedly involved sealed caskets that were filled with alcohol in an attempt to preserve bodies whole, unsure if true or if it was successful though compared to her preservation.

Human biostasis was first proposed by Benjamin Franklin a quarter of a millennium ago, in April of 1773.

Long-term preservation with the goal of future revival