How do you KNOW your toddler is ready for the toddler bed or big bed?

Ak

My daughter is a little over two years. For over a month now she has not slept in her crib for more than an hour or two at a time. If we try to make her go back to sleep in it or put her down awake, she throws up. So she’s been sleeping in our bed, or with one of us in our guest bedroom. The thing is, I can take her awake in there and she quickly goes to sleep. I’m wondering if making her crib convert to the toddler bed will help?

We also have a day bed which we are waiting to put into her room, but I’d hate to set it up just to create more issues for us.

Any thoughts/suggestions?