Baby Shower question...

BeagleMom2012

I got invited to a baby shower for a girl I've never met. She is the daughter of my DH's uncle's wife. His uncle has only been married to this woman for two years, and his stepdaughter was 21 when they got married, so it's not like he's been a father figure to her. I saw the girl at their wedding but never actually met her. When they sent out invites, they sent one to my mother in law, and put my name on that one.

I don't know if I was included on the invite just to be polite, or if they just want lots of gifts. Either way, I don't feel as though I should be obligated to go or buy a gift. I don't plan on inviting this girl to my baby shower, because I think it's weird to invite people you've never met.

Thoughts? Is it rude to not get this girl a gift?