She fasted even though she was not sure about her ghusl following menses. Does she have to make up the fast?

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Check below answers in case you are looking for other related questions:
Ruling on blood that is passed before giving birth
Some drops come out of her and she is pregnant. Should she stop praying?

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Related Answers:
Her menses ended before Fajr and she started fasting without doing ghusl
His wife does not want to fast
Why is fasting haraam for menstruating women?
Ruling on blood that is passed before giving birth
Some drops come out of her and she is pregnant. Should she stop praying?

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