She is adorable & I know you & her will very soon have your "signals" worked out... LOL! I've had dogs all my life & each & every one has had its own signal. We had a Golden Retriever who shook her head, this making her dog tags jangled a certain way & that meant "out". I had a cocker spaniel who would sit by the bed & that meant out (it was fine if I as in the bed but if I were in the kitchen -- PROBLEM). The trick I've found works best is just to take them out LOTS. And praise them to high heaven when they potty nice outside. Poor Maggie... she probably doesn't know what hit her. And she probably misses her sibling. But she's so lucky to have a new, loving home with lots of walks!