How to deal with a clingy friend?

So I have this friend (girl) who is constantly occupying my time and space on phone and social media (we don't live in the same city). She is married still envious of a girl I like. She tries to show off that she is my close friend and knows me better in front of her. I don't want her envy to rise so much that it starts affecting my relationship because she is a gossiping and negative person and we have a lot of mutual friends.

Can I limit her somehow so that I do not offend her? Or do I have to ignore her completely?
How to deal with a clingy friend?
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