
we are going through the same thing with DD1 who is 14.
The worst part is she can be so sweet, but it never lasts & when the monster bares its teeth...woah.
As for advice... well we're flying blind too

I try to talk to her as much as possible, keep communication open. I want her to know she is loved even when we are mad at her.
There are times when she is just too much...last week was one of those weeks for me & I didn't want to be around her. It passed TG

but in the meantime I did try to stay away, all I was capable of was narkiness & that's not fair, kwim? So I left it to
DH that week. Other times it's the other way around...so we kind of tag-team her.
My mum was a single mum when I was a teenager & she had my aunt to tag with. I do think having someone else, partner or otherwise is a help.
Teenagers can be horrible strange creatures but they need just as much love & care as a baby. So when you feel like you can't do that at that particular point in time, make sure someone else can.
I know from having spoken with
DD how vulnerable she can feel. So that is the one thing I keep coming back to - it's love, love, love - I don't always like her
behaviour

but I love her & I make sure she knows it.
As for how to make her behave nicely I have NO IDEA & if anyone out there has the recipe please share

.....?