Hi. That sounds a bit tricky. So is she living in a tank and you want to effectively join two tanks together? What species of Hamster is Olivia please? It doesn't really work trying to join two separate enclosures, and hamsters need one larger space really.
What size are the two tanks? Even joining bin cages together is difficult. A bridge between tanks would also be an escape route unfortunately. If one tank is large enough for her to live in, the other one could be a play tank occasionally maybe, but really they do better with a playpen for out of cage time.