Happy Safe Baby

My sister-in-law is having her first baby. My mother-in-law threw her a baby shower 2 days ago and invited the entire family. It was a large shower. Today in the mail I received an invitation for another baby shower for her that is being thrown by a close friend who was in attendance at the first shower. I already bought a gift for the first shower. Do I have to get her another gift or even attend the 2nd shower?

Adrick