of the old saying, "You can lead a horse to water, but you can't make it drink." I assume this is in preparation for BBFS between the two of you? What assurances will you have that she is taking them? When she starts, it takes about ten days to be fully effective against pregnancy. In the interim, accidental pregnancy is still possible. Are you going to monitor her dosing regimen?
Unless you WANT to be her baby-daddy, this seems a little sketchy to me, but I'm known to be suspicious of things that look TGTBT. If she's a provider more than a friend, this also portends that she will be doing BBFS with her other customers, which increases YOUR risk of STD. The fact that she doesn't have an OB-GYN of her own seems suspicious to me, as well, especially if she's a provider, as you say, unless, of course, she's underage and needs her parents' permission.
In this situation, which I have been in only once, we chose to use a spermicide. If you use it properly, its nearly as effective as a BC pill. She injects it into her VJ before you start (its deep near the cervix, so does not interfere with DATY), then she flushes it out with water or a douche solution, along with your dead swimmers, after you are finished. The most obvious drawback is it gets a little messy if you are doing MSOG. Its a little bit time-consuming so not practical for her to use with ALL of her customers, but if you are someone special to her (more than her typical customers), which was my situation, she should be willing to put in the extra effort to get you your BBFS.
randomly getting BC pills is very dangerous.. women's bodies require a delicate hormonal balance. she must see an MD for this. there is a great variety of BC pills, it is certainly NOT a one size fits all. most women wind up on a different pill than they first get prescribed so any full time provider must have a regular MD .... to do so otherwise is foolish on her part.
and as others have stated if this is in regards to having BBFS ... again not a good plan. even if you are the "only" one women's gyn area is sensitive and requires scheduled MD visits. even You can cause complications.
so .. she needs an MD .. planned parenthood is a good start til she can afford a private one.
In California, you can get a brief consult with a participating pharmacist and they'll prescribe them. Saw it on a sign at my local CVS in a Target store. Google it.
And there are online sources as well, with a consult.