Op, she sounds a little like my DD - 18.5 but always been a little immature for age - having a gap year working in retail, whilst planning to go volunteering and travelling abroad later in year.
This bit in particular stood out:
never does anything I recommend (despite it always being in her best interests). I have tried so many different ways of getting my point across yet she is completely uninterested.
I have tried to advise and guide DD with sorting some work problems, managing money, etc - I get called a control freak and that I must let her do it her way (despite as you say, us sometimes knowing better ways).
I have had to take a big step back and let her be for my own mental health - it is part of her becoming an independent adult and they only learn by their mistakes! And if she isn’t proactive in chasing underpaid Xmas hours, thats her loss.
I also sometimes feel as if I cant speak to her at all, but then other times she is very chatty, and does help in the house, cook etc, on days we work and she doesn’t. So I can see the young woman emerging and know that I have to just bite my tongue.
I had to laugh last week, I took her and a friend to local town to catch train to nearest city for concert and overnight (I was going to town anyway). She spent the whole journey there telling me how I couldn’t drive (9 months passed versus 38 yrs!) and how teenagers DO know everything. Ten mins after drop off I got a call saying she had booked her train ticket for completely the wrong day. So she doesn’t quite know everything 😂😂😂
And yes I also get the I hate you, you’re an awful mum etc. She is better with DH, but even told him the other week that he had never done anything for her ever. He is a v hands on dad, does so much for both kids, so she shot herself in the foot massively and has had to grovel to him since.
Keep hanging in, I am sure it will improve (well I hope so 🤞)