Perhaps a new approach to a conversation with your daughter might give you some more insight...
Find out what she enjoys so much about her job and see if you can apply what she's good at to future career options. (if she really enjoys retail perhaps a business degree allowing her to open her own company or be a manager, or if she likes making food perhaps she could become a chef). Find out what she'd like to do after her senior year of school. Maybe she is overwhelmed by all of the choices out there and doesn't know what she wants to do yet. It is very difficult to find a college when you aren't sure what you'd like to do yet.
Another possibility is get her friends and their moms together for a career day. Do something fun as mothers and daughters that helps them all realize some of the possibilities that are out there waiting for them. Also any careers your daughter may be interested in may be able to have her come in and see what they do for a day (often high schools encourage this too!). If she wants to be a nurse see if she can follow a nurse for a day... a teacher, maybe she could go to a different school and assist a teacher for the day.
I found out the hard way that college isn't the best for everyone. I went to college and loved every minute of it, but in the process I accumulated a ton of debt. I came out with 5 degrees, but now I am a stay at home mom opening a business that has nothing to do with any of the 5 degrees I earned. Now I am trying to pay back all of my school loans. I didn't go to an extravagant school, and I worked very hard. Often working 2 jobs and an average of 60 to 80 hours a week just to pay for my living expenses and some of my tuition. Even with all of that hard work I came out with almost $70,000 in school loans. Meanwhile, my brother went with the air force followed by vocational school to be an electrician. As an electrician he earns more than my husband who did many years of university to be an Electrical Engineer.
While I have a huge debt to repay, I am glad that I grew and matured at the college of my choice. It set the course for me to follow in life skills which was extremely important. i just wish it hadn't been so expensive to be in that incredible environment.
Where you go to college you often grow and mature. Your ideas become more concrete and you start to realize just how big the world really is.
Rushing into the decision can cause a lot of regrets later in life.
Perhaps looking at a specific school should come later on. Help her realize her dreams, what she wants to do with her life, what she enjoys and what she is good at. Find fun online personality and career tests that will show her more about who she is and what she is good at. Many places also show you what jobs you'd do well at.
Maybe have a time set aside once every other week to go out and do things that specifically focus on career options.
Perhaps a vocational school would be a better route for her to take, or maybe you might both decide for her to try a community college for a year to give her some more time to think about her future while knocking out some of the general education courses that all colleges require.
There are so many incredible options out there, and sometimes it can be very difficult to know what you want to do with the next 60 to 70 years of your life when you are just 17 years old :).
With your ex husband, maybe he could take her on some career outings. Getting everyone involved and encouraging her on what's out there could help her see how much support she has which could make these large decisions a lot easier for her.
Hope it goes well!