What do you suggest if my child want stay in her own bed?

Setting limits: Children always test us- it's their job! Our job as parents is to set limits. Talk with her before bedtime about sleeping in her own bed. When you put her down, and she comes out, put her back in her bed. Don't spend much time- just tell her "the rule is you need to stay in your bed". Be consistent and she will understand that you mean what you say. It takes time, but usually gets better.