I hope I don;t sond blunt but why don't you just do it the proper way? There are many many seb sites with info on how to intropduce cats to dogs and vice versa. I am not sure how you will fix the situation now- your poor kitty must be terrified and traumatized. I know yoiu did not realuze you would lead to this but there is so much info out there - cats need to feel safe, especially when they are not in their home enviornment. Poor little girl was my first thought - put yourself in her place, She leaves her home (whoch cats HATE to do) and is brought to a place by the person she loves who lets (from her perspective) this large beast chase her and then she gets placed in her carrier which to her is the thing she goes in when she travels or goes ti the vet - not her safe place but one where she may be associate with scary place. You would be so scared now and not know what is coming next. And cats stress so easily and can become ill - I woudldalmsot say you need to get her out of there ASAP!!!! She may be playing but she is scared still - could you fiond a room where the cat can stay by herself.
Here is one page that suggests how to intridce cats and dogs but since this is just for a short period, I don't know - I have to say if it were my cat, I would have cared for the dog (esp one that is not very obedient - God knows what he may do to the cat if you are not watching 24/7) without bringing the cat -she would be just fine in her safe place - home where she is comfortable and not stressed!!! She is still not home and she will be stressed for some time now no matter what you do.
If you do want to try this - after you have given your kitty lots of care and time and maybe some time at her own home (or better still leave her there - this dog sounds like he should not be around her to be honest) - here is one site with some instructions but you need at least two weeks to do it properly! NEVER EVER introduce cats and dogs quickly like that - I know it occasionally works but that is atypical.
http://www.cuhumane.org/topics/catdog.html
Do you also know if this dog's vaccinations are up to date?
Another site says this and this may be what you might try - "Cats are very territorial and do not appreciate any change in their environment. Therefore, no matter what, this will be a stressful situation for your cat. Be sure your cat is mentally and physically healthy before introducing her to a dog. Ask a friend to bring the dog to your home. Be sure the dog is on a leash and under control at the time of arrival. Your friend can then turn the dog and leash over to you. If your cat does not run and hide, let her make the first advances toward the new dog. If the dog displays any inappropriate aggressive behavior toward the cat, he should be quickly and firmly corrected with a slight jerk on the leash and a verbal "NO." "
This dog has to think you are the leader as well and that needs to be established first BEFORE a cat enters the picture. My best advice is to bring your cat home - she will be so greatful to you - and much healthier for it! Even if she seems fine, this will traumaitize her!!