are there dissertations on von speyr?

Yes, as far as I have been able to find, there are a few dissertations (one of which is my own). They are:

Berg, Blaise R. "Christian Marrige according to Adrienne von Speyr," S.T.D. diss., Lateran Pontifical University, John Paul II Institute of Studies on Marriage and Family, Rome, 2003.

Matro, Justin. “Christian Suffering in the Spiritual Writings of Adrienne von Speyr.” S.T.D. diss., Gregorian Pontifical University, Rome, 1999.

Miles, L. M. "Obedience of a Corpse: The Key to the Holy Saturday Writings of Adrienne von Speyr." Ph.D. diss., University of Aberdeen, Aberdeen, UK, 2013.

Schiettecatte, J. “Disponibilité aimante: L’attitude d’amour johannique chez Adrienne von Speyr à la lumière de l’exégèse contemporaine.” S.T.D. diss., Teresianum Pontifical University, Rome, 1998.

Schmidt, William. “The Sacrament of Confession as Sequela Christi in the Writings of Adrienne von Speyr.” S.T.D. diss., Lateran Pontifical University, John Paul II Institute of Studies on Marriage and Family, Rome, 1999.

Sutton, Matthew. "The Gate of Heaven Opens to the Trinity: The Trinitarian Mysticism of Adrienne von Speyr." Ph.D. diss., Marquette University, Milwaukee, WI, 2007.

Others in process. I look forward to promoting more dissertations on von Speyr's vast theological and mystical work.