You could look for transition shelters or women's or homeless shelters. A transition shelter from what I could look up on, is a place that you can stay in temporarily until you get on your feet. When you look for shelters in either areas near you or near her, check to see if they are free, pay, etc. I tried to find shelters near myself and I couldn't find as many that were in a safe area. Also when you find these shelters, call them and see if they still exist. Some still have their listings up, but they are unresponsive to calls.
Other than that, see if you can get in contact with your local human services department and see if they give a listing of places. Also, lastly and respectfully, I saw a few reviews about places that are religious based and I want to pass on to be careful of some of those places. Don't count them out, but if they are an establishment that takes people in, but are very preachy, it could be triggering for Emily. If you can find any places like that around either of your or within a respectable driving distance, then you should be able to make a plan together.
And everyone is absolutely right about you being a good friend. One of the best, but hardest things is helping someone during a very difficult transition period in their life. And in the case of having self-esteem sapped from you in your environment, it can be very demoralising. Keep doing the best you can to gently push, and guide her, I have a feeling she will be able to find a way out with you and your mother's support.
If able, and you both find a place she can go to, see if you are able to help with driving her to the location. She'll need the basic stuff. Things for searching or creating work for herself. Hygeine stuff, and then clothes she'll need for job interviews and things like that.
If you need more ideas, search up guides about surviving when homeless, low-income, etc, and you'll find people who've been in these situations and they can give advice on items that you would need, what's most important, etc.
I wish you both much strength.