If the tube has gone in the wrong position and not down the esophagus into the stomach and the milk is coming out of her nose, then the milk has gone down the trachea into her lungs and she is at great risk of either drowning or getting pneumonia. Its easily done if you are not used to tube feeding.
There is a lot of information on the above sites, including feeding a pup with a cleft palate.
If your pup is acting normal now, and you realise you have been over feeding, then start on the correct amount in the morning. Do make sure the tube is in the correct place though. Hope it all works out.