Your kiddo is now capable to identify opposite words from her work book and even match them correctly. This is a sign of her improving her identification skills that allow her not only to read the word properly but also to match it with its immediate opposite.
What you need to know:
Your kiddo is learning and she will definitely make mistakes. That doesn’t mean you should get disappointed with her. Clarify her confusions and correct her mistakes wherever required. Best is, to give her a second chance before correcting her if she has matched any opposite words wrongly, that will improve her learning experience.