Question

She was stricken with grief. She killed herself
change into past participle​

Answer 1

I think you are mistaken (you have made a mistake) here because the shoes that you have mentioned already have a verb that is in past participle:-

1. She was stricken with grief (stricken is the past participle form of strike).
2. She killed herself (killed is both the past tense and participle form of kill).

Answer 2

Answer:

Hello dear friend good afternoon