Hi,
Ive got 4 young adult DCs so have a good amount of personal experience in this area. Im not sure if you found the help you needed but if not i can offer the following support.
This is such a hard situation and more common than people realis. A lot of young people start degrees because it felt like the expected next step rather than a conscious choice, and then find themselves at 19 wondering what they actually want.
The good news is that 19 with a foundation degree and a clear sense of what she doesn't want is actually a reasonable place to be. Knowing what doesn't fit is genuinely useful information.
In terms of what helps, a private careers advisor who specialises in young adults rather than school leavers can be really valuable at this stage. The Career Development Institute (cdi.org.uk) has a directory of qualified advisors you can search by location. Look specifically for someone who works with young adults in transition rather than a school-focused advisor.
The questions worth helping her sit with right now aren't "what job do you want", that's too big and too abstract. More useful starting points are: what has she enjoyed doing even if it wasn't formal work or study, what does she do in her free time when no one's watching, and what kind of environment does she want to be in day to day. The answers to those questions are more revealing than any questionnaire.
I'd also say, the foundation degree isn't wasted. Whatever she does next, she has demonstrated she can work at degree level and she knows something important about herself. That's not nothing.
I hope she finds her way. Feel free to DM me if it would help to talk it through.