Can My 19 Year Old Sister Be My Parental Consent For A Belly Button Piercing ?

I'm 13 and I Really Want To Get My Belly Button Pierced . I Think I Am Responsible Enough To Get One Because I Got On Honor Roll My Whole 7th Grade Year , and My Parent's Said If I Did , They'd Let Me Get One . But Now , My Mom Won't Let Me . But My Sister Was Willing To Take Me Get It Done . She Has Her Belly Button Pierced , An Industrial and Her Back Dimples , Secretly . My Mom Didn't Really Find Out About It For A Year , and I Was Planning On Doinq The Same Thing . By The Way , I Live In Colorado , So Could I Get My Belly Button Pierced ?