In your first post you described your family member as having "stage fright". I paid more attention to the implied question in your title.
Characterizing a diagnosable case of social anxiety disorder as stage fright at best helps a person who completely doesn't understand this anxiety disorder. At worst it really underestimates how much social anxiety affects/can affect every part of a person's life. Your family member may have used this phrase to describe his/her feelings to you because they had no other way to explain it. Sometimes something like your phrase would also be used because the person is unable or embarrassed to fully explain the problems they are facing.
Most likely the person suffering from this disorder understands the full magnitude of how this is affecting their lives, even if that person is confused. For those on this forum who may not understand what social anxiety disorder is, but would like to for the sake of a loved on or family member, start here: https://socialanxietyinstitute.org/what-is-social-anxiety.
To go back to your question, you are asking for natural medication for treatment of social anxiety. Medication is often a first question. Please understand that anyone prescribing medication or advocating medication without seeing a patient would be wrong to do so. Not to mention, such a person should be a licensed professional. There are certainly many comments on this forum about medication. Those are personal comments/opinions of individuals - not necessarily licensed professionals, nor should their experiences or opinions apply to everyone.
Medication may reduce the symptoms of social anxiety so that a person can be allowed to work on therapy - cognitive behavioral therapy. Medication in and of itself is not a long-term effective solution for overcoming social anxiety. The long term effective solution for overcoming social anxiety is CBT. As this anxiety disorder is a learned/habit-forming thinking disorder, the solution must be to learn to think and react differently than was done in the past. Medication does not change thinking patterns in the brain. To change thinking patterns in the brain, a person needs to effectively reprogram the brain through repetition. This is the basis of CBT.
Keeping that in mind, therapy also needs to be active, not passive. I have no doubt that massage therapy would make my body feel better, but it wouldn't get to an effective solution for reprogramming my brain. Same goes for meditation. Yes, therapy must include slowing down and relaxing techniques, but even these involve actively practicing slowing down techniques.
No doubt some may like the habit of meditation or other relaxation/calming strategies, such methods alone would not provide an effective long-term treatment for overcoming social anxiety.
CBT is the effective long-term solution. For more information: https://socialanxietyinstitute.org/comprehensive-cognitive-behavioral-therapy-social-anxiety-disorder.