A bit flummoxed here. She is my youngest DD. Older one wasn’t as tricky (but had her moments)
She is definitely hormonal. Not yet started periods.
She wants to be with her phone or laptop all the time. On her own, in her room. The content she is accessing is innocent enough - no Tiktok or other social media. She plays age appropriate games and listens to music on Spotify. She likes watching videos of people playing Minecraft 
Her time on these devices is limited to an hour on each. But as soon as I go to remove them, she becomes incredibly and increasingly rude and sulky.
She will ALWAYS resist handing her phone to me, asking why, trying to put it somewhere else other than in my hand, trying to negotiate, then getting angry with me when I hold my ground. I do negotiate but never far enough for her satisfaction. She will try to insist - “I WILL have my phone NOW” - which obviously doesn’t get her what she wants so I have no idea why she does this. She will also try to find where I’ve hidden it and get it back. She has even done this in the middle of the night before. This always has the consequence of her losing her phone for a full day or more. She still does it.
Other non phone related behaviours:
Rolling eyes and sulky expression almost constantly; muttering inaudibly so I constantly have to ask her to repeat herself or speak louder; tries to gesture her way through communication rather than actually speak; hardly ever says please or thank you any more; hides herself behind hair and hoodie.
She can be absolutely lovely of course. We enjoy private jokes together, she likes me reading to her at bedtime still. She can be very kind too. And sometimes she is overly needy - wanting constant cuddles etc.
But most of the time right now she is as described.
Any attempt to talk to her about it or call her out on rudeness just makes her withdraw further.
I think her self esteem is quite shaky. I need advice on how to handle her negative behaviours without making her withdraw or damaging her self esteem.