Her father put money in the bank for her and gives her the interest as a gift

It is not permissible to put money in the riba-based bank
unless it is necessary to protect it and there is no Islamic bank. In that
case, it should be restricted to putting it in a current account with no
interest from the bank. 

The one who deals with riba knowing that it is haraam has to
get rid of the interest by giving to the poor and needy, or spending it on
the public interests of the Muslims, such as schools, hospitals and so on.
It is not permissible for the person to benefit from interest himself. 

With regard to the money asked about here, if it was
deposited in your name and thus becomes your property and you can dispose of
it, you have to get rid of the interest and advise your father to repent
from riba and to give it up; you also have to try to take the money out of
the riba-based bank. 

If your father insists on keeping it in the bank and gives
you the interest as a gift, you have to get rid of it in the ways described
above. 

The stern warnings of consequences in this world and in the
Hereafter with regard to riba are well known. Allah, may He be exalted, says
(interpretation of the meaning):

“O you who believe! Fear Allaah and give up what remains
(due to you) from Ribaa (from now onward) if you are (really) believers.

279. And if you do not do it, then take a notice of war
from Allaah and His Messenger but if you repent, you shall have your capital
sums. Deal not unjustly (by asking more than your capital sums), and you
shall not be dealt with unjustly (by receiving less than your capital sums)”

[al-Baqarah 2:278-279]

And Muslim (1598) narrated that Jaabir (may Allah be pleased
with him) said: The Messenger of Allaah (blessings and peace of Allaah be
upon him) cursed the one who consumes riba and the one who pays it, the one
who writes it down and the two who witness it, and he said: they are all the
same. 

According to the hadeeth of Samurah (may Allah be pleased
with him) about the dream that the Prophet (blessings and peace of Allah be
upon him) saw, he [the Prophet (blessings and peace of Allah be upon him)]
said: “… So we went on and came to a river, red like blood. In the river
there was a man swimming, and on the bank there was a man who had gathered
many stones. Whilst the swimmer was swimming, the man who had gathered the
stones approached him. The swimmer opened his mouth and the man on the bank
threw a stone into it, then the swimmer carried on swimming. Each time he
came back, he opened his mouth again, and the man on the bank threw another
stone into his mouth. … The man you saw swimming in the river with rocks
being thrown into his mouth is the one who consumed riba (usury).” 

Narrated by al-Bukhaari (6525). 

So hasten to repent to Allah, may He be exalted, and take the
money out of the bank. We ask Allah to pardon us and you. 

And Allah knows best.