No, she does not need to make up what she has already performed when she was a Sunni. All worships performed according to her previous sect does not need to be repeated.
As she is still a virgin, from a shar'i side, she would still need father's consent, unless she is completely socially and financially independent and free to make her own choices.
Of course, whatever the case may be, morally, it is still very important to have family involved and seek the blessings of elders and approval when it comes to marriage.
There are plenty of authentic Hadeeths from the Prophet Muhammad (SAWA) and Ahlul Bayt (AS) stating that Muslim woman must cover her entire hair as part and parcel of the obligatory Hijab. You can refer to all our Hadeeth and jurisprudence books to read these Hadeeths. The Hadeeth of Mi'raaj is an authentic very well known Hadeeth, in which the Prophet (SAWA) told Lady Fatima (AS) that he was been shown the punishment of types of sinners including a woman hanged in the hellfire because she was not covering her hair in front of outsider men.Biharul Anwar, V. 8, P.309. More narrations on this subject can be found in Mustanad Al Shia by Al-Naraqi volume 4 page 247.
'Wassalam.
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