There are a few profiles that will indicate she is ok using them.  But I've found providers who will be open to the idea if you approach the topic gently.   Some tips (no pun intended):  

 
1. Buy your own. If she's never used them before, she probably won't have any.  
2. Do not ask her about this during screening!  
3. Be prepared for her to reject the request.
4. I always bring recent test results with me as well. It adds credibility to my request.  
5. How to use:
A. Most experienced users advise to toss the little ring that goes at the bottom and not use it. It makes inserting and positioning the FC difficult and awkward and in my experience it's useless anyway.  
B. Suggest she put the FC over a small dildo or toy to make insertion easy.  
C. Leave about 1/4" to 1/2" inch of material outside the labia. You want that "skirt" to ensure your entry goes inside.  
D. She may have to hold it open when you penetrate.  
E. As with all condoms, replace after you finish. And use a separate FC for vaginal vs anal.  

 
Finally, if you write a review, be sure to tag the Female Condom box and mention it in your write up.  

 
Life is good

 
The Cat