Update: Here are my suggestions (all MS. Add.)
16950 – the great illuminated Seligenthal Graduale (OCist nuns) saec. XIII
11430 – the most important London MS. for the tradition of German religious women texts (saec. XVIII), only known copy of the letters of Heinrich von Nördlingen
15686 – this MS., illuminated by Sibilla von Bondorff (saec. XV), should be online like MS. Add. MS 15710 from the same book painter.
25089 – nice illuminated MS. (saec. XV), possibly the only known of a sister of a Nuremberg “Seelhaus”, see https://archivalia.hypotheses.org/140201
18311 – MS. with the provenance Dillingen dominican nuns (saec. XVI), see https://archivalia.hypotheses.org/140191
15102 – works of Hildegard von Bingen
only Add. MS. 25089 wasn’t digitized.