SUBREDDIT: r/relationships
TITLE: I[22F] need advice about this bridal/moving away party that my best friend's [22F] family is giving for her
POST: My best friend and I have been friends for about 4 years. My best friend's husband is in the navy and she's moving soon so her step mother wants to throw her a bridal shower(since she didn't have one) and moving away party this Sunday at a restaurant. 

Her step mother invited me to go but since I don't have a lot of money at the moment, I'm not sure how much is the appropriate amount to give and I don't know if I'm suppose to chip in to pay for the meal. Also, my best friend said that it's best to give a gift card since she doesn't know where her husband is going to be stationed. So what is a good amount of money to give?
TL;DR: 
Best friend is moving away soon and step mother invited me to the going away party. Not sure how much to give.