How to get her to sleep in her crib

Do I just have to be consistent, is it okay if she cries herself to bed in there? She’s breastfed, she’s 18 months old, and is always at my boob, but her feedings are slowing down, she’s starting to drink from cups, but I’m trying to wean the midnight feedi mg s and it’s 2am she doesn’t want to sleep in her crib, bad enough my 3 year old son still jumps in my bed in the middle of the nights lol I’m tryna get them out of my bed so I can have my space back and they can be independent but she cries when I put her in there, sometimes she okay and just rolls around and talks to herself and plays with the mobile, but she will stay awake and cry if I shut the lights and lay in my bed, I even have a night light on the stand with her, and don’t worry about the pillow, she ALWAYS throws it out along with her blankey and stuffy lol