This was a good one . It should link you to 'Why are Teens So Moody'?
https://m.youtube.com/watch?action_object_map=%5B727775767323562%5D&action_type_map=%5B%22og.shares%22%5D&action_ref_map=%5B%5D&fb_action_types=og.shares&v=du8siPJ1ZKo&fb_action_ids=10208856389993145&fb_source=other_multiline
I for one have also had to drastically adjust my parenting for me teen.
She's the one that is similar to yours but is a bit older .
She can be totally crazy and completely unreasonable one minute and then happy and normal the next.
Sometimes she screams everything she wants to say - literally screams. Sometimes she says horrid things to me or her siblings (and always to her dad). Sometimes she comes down to dinner, sometimes not. Sometimes she's in her room all day long an unshowered grumpy disaster (funniest thing I did once was let one of her friends up there , oi). Some days she's out at her travel sport, chatting with me in the car on the way, interacting with the other girls and having fun. Screaming one minute, she's out volunteering the next minute. It's a wild ride.
Anyway I pick just a few battles. I let the screaming go. I ignore the verbal stuff directed to me but call her on treating her siblings badly.
She has chores and if she doesn't do them within a week I turn off all wifi and Netflix stuff but I've scaled the chores way back as she's very busy and stressed. I let a lot of things go and try to keep the communication lines open?
That's one thing that family therapy can do for you - help you navigate having a teen which is so much different than having a kid.