She did not know that it was obligatory to do ghusl; does she have to make up the prayers?

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Check below answers in case you are looking for other related questions:
He did not know that ghusl from janaabah is obligatory; should he repeat the prayers?
Ruling on rubbing thick hair when doing ghusl for janaabah

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Related Answers:
She used to pray but she was not aware of the obligation of ghusl after menses
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He prevented ejaculation; does he have to do ghusl?
He did not know that ghusl from janaabah is obligatory; should he repeat the prayers?
Ruling on rubbing thick hair when doing ghusl for janaabah

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