what to do about friend?

[Katie]

I am friends with a girl I used to work with and we used to hang out occasionally because recently it seems she is finding ways to blow me off. I will ask her to do something and she will say she has no money or it seems she is out of town every weekend. I see on her facebook page though that she makes time after work for coffee with other friends but its always an excuse for me. Also I am the one who is always contacting her or asking her to get together. What should I do ? Not try anymore?