If she bails on you again, never, ever talk to her again. If for some horribly unlikely reason she calls you or attempts to talk to you about either her or her "friend", you have carte-fucking-blanche to be as big as a dick as you want to be. Never mind about hurting her feelings, she just stood you up TWICE. At some point, you have to look out for you and yours. Then tear up her number, put the paper scraps in some cornfield, and nuke the site from orbit. It's the only way to be sure.