She intended to fast ‘Arafah to make up a missed (obligatory) fast one week before ‘Arafah, then she forgot that intention and fasted it as a voluntary fast; is that acceptable in order to make up the missed (obligatory) fast?

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She did not fast because she was unaware that fasting was obligatory for her; does she have to make up the fasts?
She is not sure whether she formed the intention to make up a missed Ramadan fast before dawn or not, so she changed her intention to observing a voluntary fast

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Related Answers:
Ramadan began when he was in another country but he did not fast with them because he was travelling. Does he have to make up that fast?
She vomited involuntarily whilst she was fasting, and she thought that it was obligatory to make up that day, then whilst she was making it up she found out that her first fast has been valid; should she complete that day or break her fast?
She was fasting to make up missed days, but she said: I am fasting six days of Shawwaal
She did not fast because she was unaware that fasting was obligatory for her; does she have to make up the fasts?
She is not sure whether she formed the intention to make up a missed Ramadan fast before dawn or not, so she changed her intention to observing a voluntary fast

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