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Hoy mi hermana ha investigado para el artículo.

Hoy mi hermana ha investigado para el artículo.
Today my sister has researched for the article.
From Lesson 115:Present perfect for unfinished time (esta semana)·Spanish (Spain)

Questions & Answers about Hoy mi hermana ha investigado para el artículo.

Why do we use ha investigado instead of the simple past here?
Because the sentence starts with Hoy (Today). In Spain, when we talk about a timeframe that is not finished yet, like today or this week, we use the Pretérito Perfecto (Present Perfect). This tense is made with the helper verb haber (here, ha) and the past participle (investigado).
Since mi hermana is feminine, why isn't the verb ha investigada?
When you form this past tense using the helper verb haber, the main action word (the past participle) always ends in -o. It never changes to match the gender or number of the subject. So it is always ha investigado, whether we are talking about a sister, a brother, or multiple people.
Why do we use para instead of por for the word 'for' in this sentence?
We use para here because it shows the purpose or final destination of the research. She is doing the research in order to write or contribute to the article. Por is usually used for causes, reasons, or the means of doing something, rather than the final goal.
Could I change the word order and say Hoy ha investigado mi hermana...?
Yes! In Spanish, word order is quite flexible. Putting the subject (mi hermana) after the verb (ha investigado) is very common, especially if you want to emphasize the action first. Both ways are perfectly natural and mean the exactly the same thing.

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