I would suggest you hire an attorney to help you with this complicated legal matter rather than put your family at risk. If you would like a free consultation to discuss my services offerec, please call me.
Misiti Global, PLLC.
716 830 7960
It would certainly be to your benefit to contact an immigration lawyer to discuss the advantage and disadvantage of either options.
It's not really a deal breaker.
You are welcome to contact me via the link provided below if you so wish.
We would need additional information as this is a question of strategy. Generally, without additional information, We recommend you file a separate petition for your step daughter.
The answer is simple . . . ABSOLUTELY! There is no derivative status here. The child must be petitioned as a step child. You should always use a qualified immigration lawyer when dealing with the USCIS. It is too easy to make a mistake and make the process last for years, or get denied.