I think if you said you’d pay and now you won’t, that’s off. We couldn’t afford to pay for our kids driving lessons. So for 17th birthdays we said we would pay for the first 5 hours of lessons, the provisional licence cost and the cost of the tests. But at a time they could afford to continue to pay for lessons themselves.
Our eldest is 20 at uni and has not bothered yet. He’s not really interested, and the part time job he got was 1 day a week that would have fully gone on his lessons. Personally think he should have got it done, but his money and life, his choice.
Our middle son got a full time job when he dropped out of college just after turning 17. He got on a waiting list for lessons as needed to fit around work. Sadly he lost that job after 4/5 months, but I had told him to save all his money and we didn’t charge him rent, so he had some money saved up to cover lessons. He ended up going to CAB to ask for support and help job hunting or help and advice for courses etc as he just didn’t know what to do next and wasn’t having any luck anywhere. They sent him to sign on for universal credit as that got him access to a support worker for finding a job. I told him that he should use his universal credit and any savings to learn to drive, as a driving license would make him more employable, allow him to look further afield, or consider courses at other local colleges that he couldn’t get to without a car. So he’s been doing that. He took his theory test recently but failed as he didn’t know there was a hazard perception element (neither did I as that wasn’t a thing when I did mine) so hadn’t practiced and wasn’t clear from the instructions what he needed to do. So we’ve had to rebook that, and because it’s in a town with no train from our town to it, we’ve had to find an evening appointment so that we can take him to it, meaning another months wait. All of this means he’s going to have to be having driving lessons for even longer (still annoyed his instructor didn’t tell him anything about the theory test despite knowing he had it booked).
So basically it could be a massive expensive and I can see why she’s upset if you previously said you would pay. What I would do, is charge her rent and use that money to pay for her lessons, as you made the promise initially. I would pay for the licence and tests. Although she pays for any resits if she fails anything.