What should I do in regards to this friendship?

yes, you really should express what you feel to her. if she really does mean well, then she would try to do better, and listen to your feelings. if she starts to get better about those things, then you should definitely try to spend a little more time with her then you do now. also you should try to talk to her about what you are going through and why she acts like she doesn't care. hope i helped! :)