On the day of her abduction, as we saw near the beginning of the film, Albert and Cass make a "pinky promise" to each other that they will never skate with anyone else. So when Cass meets her Dad eight years later, she urges him to check whether the promise was kept. At first he doesn't understand what promise she means but then he gets it.
There was an earlier scene where Cass, in captivity, remembers the little conversation she had about "gimmick" being the right word not "trick", and that's when she hatches the plan of using those terms to communicate to her father that he should go talk to Albert. The other part of her plan is, she will ask her captor to seek information about Albert at the same time, so that hopefully this will expose the captor allowing Cass to be rescued.
Of course, this is a big hail mary, it seems it would have a very low likelihood of success, it's not as if her father would be monitoring Albert 24/7. It just was a stroke of luck that the plan worked as intended: Dad was at the rink at the very moment that the suspicious "journalist" was there asking creepy questions.
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