Most US pre-meds major in biology since, as @ucbalumnus says, it has the greatest overlap w/ med school admission requirements.
However, the post-graduation job prospects for BA/BA bio degrees are not terribly good. There are so very many pre-meds who end up not getting into med school. Every pre-med is advised to have a Plan B career in mind during undergrad. This may include majoring in something other than biology. (Both my daughters majored in math because math gave them much better employment opportunities if they did not get into med school.)
Also, you and your daughter need to understand that just wanting to be a doctor isn’t enough. Lots of high schoolers want to be a doctor. However, only about 23,000/year actually make it into med school. Only about 15% of freshmen pre-meds actually complete all the required pre-reqs classes. Even fewer complete the classes with grades high enough to get considered for med school. Of those who finish the pre-reqs with top grades AND apply to med school, only 35-40% actually get accepted.
As you can see, in the US med school admission is extremely competitive. It is also not solely based upon academics–although the first cut is made on academic achievements (MCAT plus GPA and sGPA). Many additional factors go into selecting those who are admitted. Substantial physician shadowing, community service with disadvantaged groups away from campus, clinical exposure to medicine through volunteer or paid experiences, leadership roles in their activities, and hands on lab or clinical research experience are required. Mission-fit with the specific med school is also a major consideration. (Med schools have different missions–it’s why every med school has a mission statement on their website.)
Because you/your daughter do not have a legal state of residence in the US, it will be somewhat more difficult for your daughter to get a med school acceptance. Most successful med school applicants attend a public med school in their home state. (Home state public med schools are also a student’s most cost effective option for med school.) Most public med schools heavily favor in-state applicants and restrict the number of OOS applicants they interview and accept.
Also be aware that med school will probably cost around $100,000/year by the time your daughter is ready to apply. There are very, very few scholarships to pay for a medical education. You daughter will be eligible to borrow some of the cost of med school through federal student loans (up to $40K/year).
I would remove the whole idea of pre-med from your daughter’s college search. Pre-med academics is a discrete set of classes that are offered at every US college (with the exception of art/music conservatories) and at most community colleges.
Help her find a college where she can attend that offers the best combination of fit, cost and opportunities (including the opportunity to pivot away from medicine toward another career).