Panel 1: Strangely enough, we see her talking to April, who asks for and gets permission to be a bridesmaid when the time comes. "When the time comes", of course, is whenever Elly can book the church.
Panel 2: April them goes on to state how great it is that in some distant future she, too, can have a Fauxposal.
Panel 3: And that there's some guy named Gerald who doesn't know that he's going to be manipulated into marrying her.
Panel 4: Liz's response, "Ignorance is bliss", is easily as hateful as her inviting Shawna-Marie and Dawn because she wants revenge on them because their lives aren't effed up. It also sets the pattern for April being the Butt Monkey of the Settlepocalypse. We already knew she would be, it's just the the reminder was more dickish than we could have conceived of.