"What is all this?" demanded another voice peremptorily; and Mrs. Reed came along the corridor, her cap flying wide, her gown rustling stormily. "Abbot and Bessie, I believe I gave orders that Jane Eyre should be left in the red-room till I came to her myself."
(Jane Eyre)

What's the meaning of wide?
Can should be omitted, as in "The king commanded that all the people [should] be assembled at once."?

"What is all this?" demanded another voice peremptorily; and Mrs. Reed came along the corridor, her cap flying wide, her gown rustling stormily. "Abbot and Bessie, I believe I gave orders that Jane Eyre should be left in the red-room till I came to her myself."
(Jane Eyre)

Can should be omitted, as in "The king commanded that all the people [should] be assembled at once."?