Judges 17:3 change wording from "I will give some of this silver" to what you see. The whole 1,100 pieces were dedicated, not only a portion. Her infraction was that after dedicating it, she only used about 20% for Yahweh.
Judges 17:2 cut extra clause, "for admitting that you took it" since this is not in the Hebrew and is not the reason she blessed Micah. She blessed him to countermand the curse she had uttered earlier.