Second of all, your idea that she’s keeping you around and taking advantage of your friendship is a victim position. You get to come and go as you please. If you want to stick around and be her friend, then you should take responsibility for that behavior. If you want to move on and make a clean break of things so your own emotions aren’t kept hanging on a “what if” string, then take responsibility for that decision. But you’re free to move around as you see fit for you!
Lastly, keeping in touch to make sure her mother is okay is nice guy behavior, and guess what? Nice guys finish last. You’ve only known her for four weeks, so you’re not an old buddy or a close friend. You’re a guy she dated with whom it didn’t work out. Don’t contact her unless you’re dating. That’s my advice.
You should read Date Out of Your League, a book I wrote for men who want to win with women. You can buy it at Barnes & Noble, Amazon, or right here at this link: [url]
I hope that helps. Let me know how things go, and follow me on Twitter @AskAprilcom (no dot!) as well as on AskApril.com on Facebook at this link: [url]

