I have had epilepsy since being 19. Tonic clonic seizures ever 3 weeks at worst, currently a lot better controlled but still focal seizures every week or so. These aren't much to see but can really wipe me out.
What I will say is that it's a big thing to come to terms with, the medication can utterly bloody horrible to adjust to as can the 'invisible' effects of epilepsy, not just the full on seizures, thrashing around and peeing yourself etc that you see. Anxiety and depression are really common comorbidities for instance. Therefore my main advice would be to please not put pressure on her to fulfil the same goals you have set yourself at the same pace. Your expectations of her need to be adjusted.
However, I get the impression you are asking in good faith and it isn't all about your family bankrolling her (their concern as you say) so I am happy to share my experiences so you can consider helping her with a longer term plan if she wishes.
I don't know her strengths or ambitions (if all was equal). However, what do you think of discussing long terms goals with her rather than the type of work she is looking at which can be quite precarious employment with long hours, lighting etc that may affect her?
I worked at director level in the public sector and am now retraining in a clinical field so some people absolutely can work with epilepsy, especially when reasonably well controlled. I have also got 2 degrees, travelled extensively, worked abroad, learnt several languages and have done a lot of charity work and interests. But not all at once when I was only just getting my seizures controlled. 1-2 months seizure free is not cured.
However, if we are being realistic, certain jobs are more protected and more suitable than others.
I have had this condition whilst working in retail and hospitality as a student as well as whilst working my way up and frankly have experienced some open discrimination as well as managers being exasperated by me being late in yet again after another focal seizure. My advice is that where you work really makes a difference.
That is to say, some organisations have rock solid anti-discrimination policies that make your position a lot more secure even if your work is affected- reasonable adjustments etc.
There are only so many reasonable adjustments that can be put in place on a shop floor when the main one with epilepsy (in my experience) is that sometimes you simply can't be there.
I would recommend the public sector, for instance civil service or NHS admin.
This approach may alternatively involve looking at what she wants to do and accessing the training if it is more specialist. If she likes the idea of, say, HR or business management then she should look at how to get the qualifications needed to make a solid start in these, a degree maybe.
In my experience, a job where you're part of a big organisation that has deep rooted policies to support disabled staff and applicants, may be a lot easier than a bar or shop job when managing epilepsy. It is also easier if you're doing a role with some flexibility. This isn't compatible with all jobs but office/ WFH may be easier for her to work around her symptoms than shop floor.
Not saying these places are perfect of course but they have good sick leave and OH provision.
But with respect, I'm not sure this young woman is surrounded by people who fully understand her condition if you're writing about her getting her nails done when she's only just stopped having weekly seizures. This is bound to have been a very unsettling couple of years for her indeed.