Theophylact of Ohrid

Then "trembling and astonishment" seized the women, that is, they were struck both by the vision of the Angel and by the awe of the Resurrection, and therefore "they said nothing to anyone, for they were afraid." Either they were afraid of the Jews, or they were so gripped by fear from the vision that they had, as it were, lost their senses. And so they said nothing to anyone, having forgotten everything they had heard.

Commentary on Mark ↗

Augustine of Hippo

There follows: And they went out quickly, and fled from the sepulchre, for they trembled and were amazed. (de Con. Evan. iii. 24.) We may however enquire how Mark can say this, when Matthew says, they departed quickly from the sepulchre with fear and great joy, and did run to bring his disciples word, (Matt. …

Catena Aurea by Aquinas ↗

Bede

But they went out and fled from the tomb (for trembling and amazement had seized them) and they said nothing to anyone. For they were afraid. It rightly raises the question of how Mark writes: And they said nothing to anyone. Whereas Luke says: And returning from the tomb, they told all these things to the eleven and to all the rest. Similarly, Matthew: And they departed quickly from the tomb, with fear and great joy, and ran to tell his disciples (Matthew 28). …

On the Gospel of Mark ↗

Peter Chrysologus

It is said also in a marked manner, that they said nothing to any one, because it is the part of women to hear, and not to speak, to learn, not to teach.

Catena Aurea by Aquinas ↗