Remember, in non meta contextual sense, Kiyoko is the canonically screwing herself over by not screwing the vagina PC. The main incentive for us fucking her was so that we could share Chi with her, which can be received by any kind of sexual contact. Kit making is only a byproduct of her want for children, which consecutively means that:
She would rather be stuck in a pocket dimension forever than slam clams.
We as players lost opportunity for some lesbian sex babies.
So, all in all, she deserves to be left there.