T.K.
don't let it annoy you. Take it at face value without assigning a sinister motive. You have been invited. That's all. That is a nice thing to do. You are not obligated to go or to send anything.
The bride may have nothing to do with it. My niece is getting married and her hostesses have reached out to me to get names and addresses of people to invite. What do I know? lol The list I provide, may have people on it that I think would be offended if not invited. But, I'm of the mindset of don't leave anyone out, not invite them so they will send a gift.