I'm thinking of ghosting a very lonely lady I only just befriended
Why do you want to do that?
She only cares about others and never thinks of herself, she is a selfless person to be around.
She sounds like great person who is trying to make friends. Why not invite her to do something fun and see if you can get to know her better?
I'm just joking. I'm going to use her to fill the time and then I will never hear from her again.
This is a very cruel thing to do to someone, especially someone as nice as her. Maybe you will find out that you enjoy her and don't want to ghost her.