Should I give a gift or not?

I'm thinking that the bride-to-be wasn't taught any manners. I would not attend the engagement party and I would not give her any money. No wedding invite; no money/gift. Instead I'd treat myself to a very nice meal and have a drink in her honor. You might lose her friendship but in my estimation she isn't much of a friend. And I think Colleen went a little over the top, don't you? lol