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That's an easy answer. Nobody cares about her and nobody wants her. Her figures were basically given away by shops for pennies.
https://web.archive.org/web/20191007130206/https://www.themarysue.com/where-is-rose/
@matrix
Character was boring.
Toys didn't sell.
Someone with a Vietnamese background doesn't work in the Chinese market and is just not beautiful enough for that market.
Pick your poison! ;-)