>>713448090
it was retconned. toby felt the need to add her to undertale, even doe her being missing could allude to deltarune like rudy being sick.
picrel: daughter
2020 version: daughters https://undertale.com/alarmclock/asgore/

>>713313371
keyword "was"

dess was meant to be deltarune chara, but was turned into another deer when people got upset at the prospect of chara being in deltarune.
that's why she "didn't exist" in undertale. it was a hint to her human identity
https://undertale.tumblr.com/post/165367197345/undertale-2nd-anniversary-and-alarm-clock