All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu ‘alayhi wa sallam, is His slave and Messenger.
It is permissible for you to use your salary and whatever was bought with it such as food, clothing and the like, regardless of whether you earned it from your job revising the school textbooks earlier on, or from your work as a teacher of girls, because the textbooks containing things related to Riba (interest and usury) or some female students not wearing Hijab by itself does not involve you doing what is forbidden or helping do it.
Just because the students study how to calculate interest and the like, it does not necessarily follow that they receive interest, because the information is a secondary element and not the purpose in itself. Similarly, just because a female student does not wear the Hijab, it does not prevent from teaching her things that are permissible. However, she should be told to fear Allaah and abide by His commands, and she should be stopped from evil as much as possible.
It is also permissible for you to use the income of your father. Blacksmithery is permissible profession and the fact that such a profession and the like of it may affect the environment does not make it forbidden; rather, it is one of the professions that people need and it is a necessity, like their need for cars, factories and the like, which have the same consequences, like most professions.
As regards the issue of the father's lack of concern with marrying off his daughter, we have already clarified the consequence of this and what the daughter should do in such a case in Fatwa 282694, so please refer to it.
We should point out that this custom is incorrect and has no foundation in Islam, because it is the husband who gives the bridal gift to the wife and not the other way around. We have already explained the ruling on this in Fatwa 85873.
Finally, we ask Allaah to help you to do all that is good and make your affairs easy, and to bless you with a pious husband to your delight, one who will make you happy in this world and in the Hereafter.
Allaah Knows best.