She got her menses after ‘Arafah and did tawaaf when she was menstruating

Firstly: 

Getting one’s menses does not affect ihram and does not
prevent one from doing the rituals, except that it is not valid for women
who are menstruating or bleeding following childbirth to do tawaaf until
they have become pure, because of the report narrated by al-Bukhaari (305)
and Muslim (1211) from ‘Aa’ishah (may Allah be pleased with her), that when
she got her menses just before entering Makkah for the Farewell Pilgrimage,
the Prophet (blessings and peace of Allah be upon him) said: “Do what the
pilgrims do, but do not circumambulate the Ka‘bah until you becomes pure.” 

Al-Bukhaari (4401) and Muslim (1211) narrated from ‘Aa’ishah
that Safiyyah bint Huyayy, the wife of the Prophet (blessings and peace of
Allah be upon him) got her menses during the Farewell Pilgrimage, and the
Prophet (blessings and peace of Allah be upon him) said: “Is she detaining
us?” I said: She has already done tawaaf al-ifaadah, O Messenger of Allah.
The Prophet (blessings and peace of Allah be upon him) said: “Then let her
leave.” 

Secondly: 

One of the essential parts of Hajj is tawaaf al-ifaadah, the
time for which begins from the middle of the night before the Day of
Sacrifice. It is permissible to delay it until the end of Hajj and to
combine it with the farewell tawaaf, with one intention. 

It is not permissible for a woman who is menstruating to do
tawaaf al-ifaadah at the time of her menses, unless she has come from a
distant country and it is not possible for her to remain in Makkah until she
becomes pure, or to return to Makkah after she becomes pure in order to
complete her Hajj. 

Based on that, if you did tawaaf al-ifaadah after the middle
of the night before the Day of Sacrifice, and after standing in ‘Arafah, you
do not have to do anything further, because the farewell tawaaf is not
obligatory for the menstruating woman, as we shall see below. 

And if your menses came after Arafah and before doing tawaaf
al-ifaadah, then you did tawaaf al-ifaadah when you were menstruating, or
you delayed this tawaaf until the time of the farewell tawaaf, and did
tawaaf when you were menstruating, then your tawaaf was not valid, and you
have not completed the second stage of exiting ihram; you have to go back to
Makkah and do tawaaf al-ifaadah, and it is not permissible for your husband
to be intimate with you until you have done tawaaf. 

Thirdly: 

The menstruating woman is not obliged to do the farewell
tawaaf. If she has already done tawaaf al-ifaadah, then she gets her menses,
she may leave Makkah without doing the farewell tawaaf and she does not have
to do anything further. 

Fourthly: 

If intercourse occurred in the past, when you were unaware of
the ruling on your situation, then there is no blame on you, but it is not
permissible for you to do that in the future until you complete your Hajj. 

For more information, please see the answers to questions no.
47289 and 112271 

And Allah knows best.