Her quick wit told her what was happening.

In frantic haste she flew to the door but it was locked; no shaking, no screaming, no thumping seemed to reach the ears of the guard whom she heard monotonously walking up and down outside her prison.
And now the tumult and clang of arms grew louder and louder, and the rattle of drums and blare of trumpets began to mingle with the sound.
She rushed to the window in mortal fear, and looked down into the palace-yard; at that same instant the door of the great banqueting-hall was flung open, and a flying crowd streamed out in distracted confusion--then another, and a third--all troops in King Philometor's uniform.

She ran to the door of the room into which she had thrust her children; that too was locked.

In her desperation she once more sprang to the window, shouted to the flying Macedonians to halt and make a stand--threatening and entreating; but no one heard her, and their number constantly increased, till at length she saw her husband standing on the threshold of the great hall with a gaping wound on his forehead, and defending himself bravely and stoutly with buckler and sword against the body-guard of his own brother, who were pressing him sorely.

In agonized excitement she shouted encouraging words to him, and he seemed to hear her, for with a strong sweep of his shield he struck his nearest antagonist to the earth, sprang with a mighty leap into the midst of his flying adherents, and vanished with them through the passage which led to the palace-stables.
The queen sank fainting on her knees by the window, and, through the gathering shades of her swoon her dulled senses still were conscious of the trampling of horses, of a shrill trumpet-blast, and at last of a swelling and echoing shout of triumph with cries of, "Hail: hail to the son of the Sun--Hail to the uniter of the two kingdoms; Hail to the King of Upper and Lower Egypt, to Euergetes the god." But at the last words she recovered consciousness entirely and started up.