She did Hajj before she became religiously committed – should she repeat her Hajj?

Firstly: 

We praise
Allaah for having guided you to obey Him and seek His pleasure, and we ask
Him to make you steadfast until you meet Him. 

Secondly: 

The Hajj
that you did before is sufficient and counts as the obligatory Hajj, and you
do not have to repeat it, even though you were falling short in your
religious commitment and wearing hijab, unless at that time you also
neglected the prayer and persisted in missing prayers even during Hajj. In
that case your Hajj does not count because not praying constitutes kufr, and
Hajj is not valid if there is kufr. 

Shaykh Ibn
‘Uthaymeen (may Allaah have mercy on him) was asked: If a person who does
not pray or fast does Hajj, what is the ruling on his Hajj when he is in
that state? 

He replied:
Not praying is kufr that puts a person beyond the pale of Islam and means
that he is doomed to eternity in Hell, as is indicated in the Qur’aan and
Sunnah and the words of the righteous salaf (may Allaah have mercy on them).
Based on that, it is not permissible for this man who does not pray or fast
to enter Makkah, because Allaah says (interpretation of the meaning): 

“Verily,
the Mushrikoon (polytheists, pagans, idolaters, disbelievers in the Oneness
of Allaah, and in the Message of Muhammad) are Najasun (impure). So let them
not come near Al‑Masjid Al-Haraam (at Makkah) after this year”

[al-Tawbah 9:28]

The Hajj
that he did when he did not pray is not valid and not acceptable, because it
was done by a kaafir, and acts of worship done by a kaafir are not valid,
because Allaah says (interpretation of the meaning): 

“And
nothing prevents their contributions from being accepted from them except
that they disbelieved in Allaah and in His Messenger (Muhammad), and that
they came not to As-Salaah (the prayer) except in a lazy state, and that
they offer not contributions but unwillingly”

[al-Tawbah 9:54]

End quote
from Majmoo’ Fataawa Ibn ‘Uthaymeen (21/45). 

And Allaah
knows best.