Hello I am sorry to hear that your girl got a hold of some rat bait. My name is ***** ***** I would be happy to help.
Even though it was only a small amount I would suggest inducing vomiting to try to get any of the poison out. This can be done by giving 3%hydrogen peroxide at a dose of 1 teaspoon per 10lbs of body weight. Giving a 1/2 piece of milk soaked bread will help give her something to vomit up. You can also mix the peroxide with a tablespoon of milk to mask the taste. After giving walk her around to mix the stomach up. If she does not vomit with in 10 minutes this can be given one more time.
If you are able to get her to vomit you still want to watch her closely, some rat poisons interfere with the clotting factors of the blood others cause swelling in the brain. There is no antidote for the type that causes the brain swelling.
If at all possible just to be on the safe side I would have her seen tonight at your local ER. If that is not possible I would keep a close eye on her tonight. If she seems depressed, stumbles or seems off neurologically at all having her seen tonight is a must. If she does ok then I would give your regular vet a call in the morning, let them know what happened and see if they want to put her on a round of Vit K1 as a precaution.
I do not think if she just got a small amount that scrapped off on her teeth this will cause major complication however considering her small size it would be best to err on the side of caution.
I hope this helps and she does ok. Please reply back if you have additional questions and I will be more then happy to continue. If you have no additional questions please take a few moments to provide a rating so I am compensated by just answer for assisting you this evening.