I do think continuing to work will work out much better in the long run, as it's an apprenticeship, and hopefully she will be able to make even more when she's qualified. And if she intends to set up house with her worthless bf, she will need to be able to earn or she will end up homeless. The feeling sick is probably down to morning sickness, and B6, maybe B12 too, would help. Bully her into taking the vitamins and making her own appointments though. She urgently needs to tell her employer -- there are health and safety issues, as well as break times, etc. that her employer needs to sort out, as has been said.
As for the huge amount of money she's gone through in the past little while, plus your phone and the scissors, as well as the thought of giving her bf money -- I am gobsmacked (especially if he has asked her for any). No more giving her any money for anything, is my advice. The boyfriend is seriously bad news and in the long term, I hope you will not be encouraging this relationship. There is no way she should be giving any money to him or even thinking about it.
I also don't see the point of continuing driving lessons at this point, unless she's in a position to buy and run and insure a car. She should do this for herself at a later stage when she is working and can afford it.
WRT her own earnings, you are wise to make her save. Make sure it's you and not the bf who accompanies her to buy necessary items for the baby when the time comes.
She urgently needs to learn to budget and to take care of expensive things, her own and things like your phone. There's a point where money going through her hands like water becomes a real problem, and that's where she is now. You and your DH need to sit her down and ask her to write out exactly where her money goes every day, and produce receipts to prove it. She needs to be completely accountable to you wrt money. If the bf has spent any of her money she needs to account for that too, to you. He sounds like a complete sponger.
There seems to be a relationship issue between her and the bf if she is giving him money, but that can be tackled later.