Mildred is a character from Meet the Robinsons. She is the director of the Sixth Street Orphanage. She took Lewis in when he was just a little baby.
In the scene where Lewis & Lucille Krunklehorn test the Memory Scanner, using her memory of her wedding, one bridesmaid looked like possibly Franny's mom, and the other looked like Mildred, only with a part of her hair slightly to the left.
Her last name is revealed as Duffy when the one of the couples came to adopt a child and didn't like Lewis's PB&J machine; Mrs. Harrington addresses her as "Ms. Duffy" and leaves angrily.