Is someone a best friend if they have yet to invite you over to her house?

For becoming a friend, it is not necessary that u should invite him/her to ur house. Also dont make this a big problem and depress over this. From ur writing I understood that She is a true friend of urs and its rare to find such a friend. And u r so lucky to get one, so dont miss her. I think her house is so small or some financial prob in her house tats y she is not calling u. So make it a big prob, try to undderstand her and be her friend, dont miss her. Such friends are rare to find.