Sleep

I know this is for July 18 babies, but the July 2020 babies group doesn’t post anything. I have a July 2018 and a July 2020 baby. My oldest sleeps great and we have no issue putting him to bed, but my youngest who is 1 and a half years old cry’s every night for 3 or 4 hours to go to bed. We’re trying everything. She instantly starts to cry after I am done rocking her. I know she’s tired too but instantly stands up in her crib and throws her stuffed animals and blanket out of the crib. Any tips on how to make her to go to bed?