Office of St Hildegarde of Bingen, Virgin and Doctor of the Church (Memorial or Optional Class III)
The 1962 Benedictine calendar includes St Hildegarde as a memorial only, on September 17, however consistent with the decree Cum Sanctissima, it is now possible to celebrate the feast as Class III.
Day hours
For those who wish to follow that option, simply use the Common of a Virgin for the antiphons from Prime to None; antiphons and psalms of the day with the rest from the Common for Lauds and Vespers (presumably with the Magnificat antiphon of a doctor, although the supplement to the Antiphonale Monasticum does provide some specific to the feast as an alternative).
Collect
The updated collect for he feast following her official canonisation and elevation to Doctor of the Church is:
Deus, fons vitae, qui sanctam Hildegardem, virginem, prophético spiritu imbuisti, fac nos, quaesumus, eius exémplo et intercessione, vias tuas scire et in huius saeculi caligine lucis tuae claritatem cognoscere. Per Dominum.
Matins reading
Bermeshemii, in Germania, anno 1098 orta est, et anno 1115 apud abbatiam Benedictinam Montis Sancti Disibodi, religiosam professionem nuncupavit. Anno circiter 1150 monasterium Montis Sancti Ruperti, prope Bingium, fundavit et uti abbatissa rexit. Scientiis naturalibus et arte musica perita, ita in plurimis scriptis revelationem, quam mystica contemplatione experta erat, clero et populo pie exposuit, opera pamitentice pnedicavit et errores contra doctrinam confutavit, ut etiam principes et Romani Pontifices consilium eius sollicite exquirerent. Morbo affecta, obiit anno 1179.
[Hildegard was born in Bermersheim in Germany in 1098, and in 1115 she entered the Benedictine abbey at the Disbodenberg. Around 1150 she founded the monastery at Rupertsberg, near Bingen, which she ruled as abbess. She was expert both in natural science and in music. In her contemplative prayer she received mystical revelations which she communicated in very many written works, directed at clergy and laity alike. She preached penitence and disproved doctrinal errors, so that even princes and Popes turned to her for advice. She died of an illness in 1179.]