allopathic path is traditional treatments - medication, talk therapy ECT,

osteopathic treatment path is alternative treatments like yoga, tai chi, and other non-medicated breathing/ relaxation exercises, acupuncture is also an osteopathic treatment.

example

my allopathic path is my antidepressants, therapy sessions

my osteopathic path is going to a weekly yoga class, I also get acupuncture, massage, and chiropractic care to relieve stress in my body.

together my allopathic treatment plans and my osteopathic treatment plans complement each other to help me live the best I can give my mental and physical health issues.

your friend may feel that you are not open to trying osteopathic treatments like mindfulness, meditations, yoga, exercise plans and so on.