Bridal Shower Etuiquette

I was recently invited to a Bridal Shower by a girl that I hardly know! I will be attending her wedding as a guest of one of the groomsman. I only met her twice, briefly, two years ago. Not only that I dont think I should attend her shower, but I am also considering not sending her a gift. I thought these things were for family and friends only. I am definetly getting her a wedding gift though. Is this appropriate?