Marathon bombing survivors Mery Daniel , Adrianne Haslet , and Heather Abbott — who are all amputees — were invited backstage to meet Beyoncé before her show at the TD Garden on Tuesday night. Daniel told us that the superstar was easygoing, despite the fact that she’s, well, Beyoncé. “She’s actually very nice and down-to-earth,” Daniel told us on Wednesday. “A lot of people think she’s Queen B . . . but her energy was very nice.” Daniel added that the three women and their companions were given seats that were “like, on stage,” and that she’s pretty sure that Beyoncé invited them after seeing the trio on the cover of People magazine in June.