i know a few bee facts, like the fact if a young queen is unfitted to become a queen, she changes to a normal female, which makes me wonder if trizza died at some point (maybe even killed by feferi?) or if she simply lost her status as heiress

You do know, Condy is very explicitly said to kill the aspiring Heiresses when the time to take the throne comes. If someone doesn’t kill her by the time Hiveswap is over, Condy will.