can you not leave the door open for her to come right back in once she is done ?
other than that, i would say you take her out on lead, or take her out past the deching and block off the decking so she cant get back on it till you let her.
other than that, i would say you take her out on lead, or take her out past the deching and block off the decking so she cant get back on it till you let her.