Ellen MacGregor (1906 - 1954) was an American author, primarily of children's literature. After a varied career in numerous libraries and publishing several well-received children's books, as well as numerous magazine articles, she died in 1954 at the age of 47.
MacGregor's goal was to provide fantasy literature with correct (for the time) scientific facts that would appeal to children. The first appearance of Miss Pickerell, her famous and quirky major character was in a short story, Swept Her into Space, published in Liberty in 1950. She expanded it to book length, published in 1951 as Miss Pickerell Goes to Mars, a science fiction novel for children.
Yet another in this cute series about good old Miss Pickerell and the amazing adventures in which she finds herself, along with her numerous nieces and nephews, her cat Pumpkins and her much adored cow, Nancy Agatha. Heidi, you should check this older series out. They're really cute. Portsmouth Library has a number of them. Suffolk has two titles listed. They're well worth a look.