“Bacastow, in addition to being more than “fairly pretty” with “rosy cheeks and cheery disposition,” has a lovely soprano voice, which manages to be both light and airy and powerful enough to fill the theater…. [she] lightly and skillfully treads that fine line between self-confidence and arrogance, and as soon as Mary arrives, we realize, like the Banks family, that we are going to be in good, capable hands for the rest of the show.”