Need relationship advice?

I started dating this wonderful girl back in September. We got along well and have lots of fun together. We would text each other daily and usually saw each other at least once per week, however since she got a job promotion she has been really busy and stressed out. Our daily texting dwindled down to pretty much nothing and I haven't seen her in almost a month.. The last text message she sent me was over 15 days ago and I haven't heard from her since then despite sending her several texts. I know shes ok, because she frequently posts stuff on facebook and other social media sites. Her mother and sister are currently in town and I was supposed to meet them while they were here.. So my question is..does it sound like this relationship is over? any advice would be appreciated