I'm sorry, but it sounds like she is less interested in the friendship than you are. It sounds like she has difficulty with confrontation so, rather than tell you she doesn't want to hang out, she makes up these excuses. It would be nice if she could be more direct with you, but a lot of people are like this. They find it too hard to say "I don't want to hang out," so they make up an excuse. Do you have other friendships you can focus on instead?