Tough situation. I myself don't wear perfume but I do have those automatic air fresheners in my home and I use fabric softener in my laundry. I would honestly be offended if someone asked me to switch or not to use any. It is my home and my business. I would say that you should just try and get used to it or find someone else. You also mentioned that there is a language barrier as she doesn't speak much English so you also need to remember that in her culture strong smells could be the norm.