When my youngest was a junior in high school, she came to me a bit concerned and a bit sad because her friends knew what they wanted to do with their lives, but she had no idea. I pointed out that yes her friends did know what they wanted to major in and what careers they wanted, but in six months they will have a different idea, and then a year from now they will have a still different idea.
It is very common for a student to change their major after arriving on campus at university. At the point that I graduated university (with a degree in mathematics), I still had no idea what I wanted to do with my career (I did eventually figure it out, but it took a few years). This is common. We try a bit of this and a bit of that, and eventually we figure out it.
Becoming a doctor is a long path. It takes a lot of work over a long period of time. It also requires the ability to find a way to pay for 8 years of university.
Many students who major in biology or biochemistry end up with some form of graduate school. PhD’s are typically fully funded, but with a stipend that is barely enough to live on and some parent financial help can make the marathon a bit easier to handle. Master’s degrees, MD’s, and DO’s are typically not funded.
With an undecided daughter who is interested in biology or biochemistry I think that you should try to avoid debt for a bachelor’s degree if you can reasonably do so.
And of course there are lots of opportunities in the medical world other than getting an MD.
It sounds like your daughter is thinking about the right things, and asking the right questions. There is lots of time to figure this out.