她拿不定主意穿什么好。

She was dithering over what to wear.

《牛津词典》

这两件短恤衫她拿不定主意究竞挑哪一件给她女儿。

She hesitated over the choice between the two blouses for her daughter.

youdao

她忖量了半天，还拿不定主意。

She turned the matter over in her mind for a long while, but still could not come to a decision.

《新英汉大辞典》