Or, change numbers because you want to move forward into your own life, one she's not in? Blocking always seems so "negative" to me, so defensive instead of assertive. One ends up with address books with pages of crossed out people in them and that has always struck me as sad. I just get a new book, copy over the people I want in my life now, and then trash the other book (not always, I have the small address book from college still, in the 1960's/70's :-)