Constance Wachtmeister

According to Readers Guide to The Mahatma Letters to A. P. Sinnett:

Wachtmeister, Countess Constance, companion of HPB and co-worker after HPB's return to Europe in 1885. Shortly after HPB's death, the Countess wrote a small book entitled Reminiscences of H. P. Blavatsky and "The Secret Doctrine" in which she told of her life with HPB from 1885 until the latter's death. ML index; HPB VI: 448; D, p. 562 et seq.