Definitely try to get shadowing.
But more importantly, start looking into summer programs for her to work under a professor. Notable ones include RSI, Simons, SIMR, etc, which only Juniors can apply to. Sophomores can apply to lower level programs and gain early exposure as well (IE COSMOS in California or other similar medical-related programs). Once you gain entrance to a program and work under a professor, look into getting a research paper/getting published. Work hard and from there reap the benefits by submitting your research to a prestigious science competition like Siemens or Intel STS. There are also non-“paper” based competitions such as Google Science fair and Synopsys.
If your daughter can get into finals for any of these competitions it will SIGNIFICANTLY bolster her chances at making a BS/MD.
This is kind of the “stereotypical” path I suppose, but it’s hard for sure. Above all make sure your daughter really wants to go into medicine. But if she does, this will certainly be what I recommend.