There are 3 times when she might appear:
1. In one of the game's endings.
2. In a post-credits sequence.
3. In "1980s Mode".

试试自己翻译一下“
以下有三种情况她可能会出现：
1.游戏的结局之一
2.片尾彩蛋（？）
3."1980s Mode"

有关“1980s Mode”
1980s Mode" is a planned gameplay mode that would take place in 1989, starring Yandere-chan's mother as the protagonist.
“1980模式“是时间发生在1989年， 以Yandere-chan的母亲为主角的游戏模式。

既然有ayano母亲的立绘，那肯定就有情报酱父亲的立绘了，肯定还有老学长还有那个被害死的女学生之类的