New cat and a dachshund

We are in process of adopting an adult rescue Siamese. She is in a room away from the dachshund and the older male tuxedo cat. We've seen that our new cat can really jump, but thinks she's safe under the bed or cupboard where, if the dog got in her room, she could go after the cat easily. I'm not sure if the cat would instinctively jump to higher ground to avoid the dog? Our other cat gets chased by the dog some, but he swats at her at times. The dog has never hurt our other cat.

This new Siamese is so affectionate, and not shy, just goes under the bed when she hears the dog at the door of her room. I thought we could introduce the cats first using the suggestions on your sight(using scents) , then let the dog meet her same way, however keep the dog on a leash so she could get away. Our dog is aggressive and likes to hunt groundhogs etc. She's about 17 lbs. She also barks and whines.
What's your advice about introducing the cat to the dog?