I'm sorry, but to me it rather sounds as if YOU have pushed her into this frame of mind, perhaps by being over keen that she does well and conforms at school.
When I was a TA working with Year 2 children, we had a girl who would never conform or do anything the teacher required of her. I suggested we try an experiment, and instead of these constant battles, that we set work for the rest of the class, but for this occasion we tell the girl she need NOT do what the others were doing, but she could choose something for herself.
Guess what! Once the pressure was off her, she did choose to do the same as the rest of the class were doing!
Now, I don't claim a strategy like this will always work, nor might it work for every child, but I feel your DD is intelligent and aware, as she says she can be YouTube 'vlogger' or a singer, so won't need English and Maths!
She probably has confidence 'issues' which may have arisen because she feels, what ever she does, she can't meet the standards that you (unknowingly) have set for her. I would guess that, inside, she is very unhappy and confused, and doesn't know how she can cope with life. You say you TRY not to put pressure on her, but I think that is exactly what you are doing.
A couple of questions: is Dad on the scene, and if so what does he think about things? How does he react, and what stance does he take? And are there any siblings, and if so how are they doing in school, and what age are they?
I think you need to get professional support for her, while she is young, and before any long-term damage is done.