She did not offer udhiya(qurbani) for years; should she make it up now?

Muslim femail who has been earning since a few years but recently came
to know that Qurbani is wajib on her because she is earning. How can
she compensiate for all those previous years for which she didnt offer
sacrifice.
Praise be to Allaah.
Firstly:
The scholars (may Allah have mercy on him) differed with regard to the
ruling on udhiyah: is it obligatory or Sunnah mu'akkadah (a confirmed
Sunnah)? The correct view is that it is Sunnah mu'akkadah for the one
who can afford it, but there is no sin on the one who does not do it.
For more information, please see the answer toquestions number 36432 and 41696 .
Secondly:
If a person does not offer udhiyah although he can afford to do so, he
is missing out on a lotof reward that results from offering the
sacrifice, but he is not sinning, and he does nothave to make up what
he missed in years past, because udhiyah is Sunnah and the time for it
has gone. This is the case if he did not make avow to offer a
sacrifice, in which case it is obligatory for him to fulfil his vow
and offer udhiyah.
It says in al-Mawsoo'ah al-Fiqhiyyah (34/46): If a person does not
offer a sacrifice before the time has passed, if it was a voluntary
sacrifice he should not offer it; rather he has missed the opportunity
to offer a sacrifice this year. But if it was a vow, he has to offer a
sacrifice and make up what he was obliged to do. End quote.
Based on that, if she wants to offer udhiyah, then from now onwards
she has to prepare ahead of time, so that when the next Eid al-Adha
comes, in sha Allah, she will have prepared her sacrifice beforehand,
so she will not have missed the timefor udhiyah, as happened in the
past.
We ask Allah to help us and you to do that which He loves and which
pleases Him, and to accept righteous deeds from us and from you.
And Allah knows best.