She wants to open a beauty salon and is asking about offering her services to non-Muslim women

I live in the United States and I am planning to open a hair salon,
but I heard that it is not permissible to offer this service except to
Muslim sisters who wear hijab. But in fact the location of this salon
will be in a place where there are no Muslims and the Muslim women who
come to it will be coming from far away, which is another matter
altogether. At the same time I cannot close the door to non-Muslim
women; rather from experience when I was a student in university
studying cosmetology it seems to me that this field is an opportunity
for da'wah because non-Muslim women will ask about why I wear hijab
and sometimes we have a detailed discussionwhich may lead to one of
them being guided, if Allah wills. In addition to that, most of my
neighbours are non-Muslim, as are some of our relatives, and all of
them want me to offer my services to them. What is your opinion?
Praise be to Allah.
Firstly:
For a woman to work as ahairdresser for women is permissible in
principle, solong as that is not accompanied by any haraam things that
usually accompany this kind of work.
See the answer to question no. 120891
Secondly:
If most of the people in the place where you choose to work are not
Muslims and your work will basically be with kaafir women, then it is
not permissible for you towork in the field, because all of the
required guidelines on working in that field cannot be adhered to with
those who do not believe that these things are haraam and do not
adhere to thatat all. Undoubtedly working in that field will be
helping them in not covering and in making a wanton display and
uncovering, and even nakedness and changing the creation of Allah.
Allah, may He be exalted, says (interpretation of themeaning):
"Help you one another in Al-Birr and At-Taqwa (virtue, righteousness
andpiety); but do not help one another in sin and transgression. And
fear Allaah. Verily, Allaah is Severe in punishment"
[al-Maa'idah 5:2].
Thirdly:
With regard to the issue of mixing with these women and calling them
to Islam, this is a noble and important matter. However, it is not
permissible to participate with them in whatever they do of sins, or
to help them in that. It is not permissible to commit a certain sin
for the sake of a hoped-for or imagined interest. It is possible to
achieve the interest of da'wah by other ways or in other places where
it is not necessary to help them in sin.