i entered mine single handed aswell mate at 12 months old aswell no probems! doublingthem up is ok but your dog may become too reliant on the more experienced dog and grabbing them by a**e!
i had a 5/8 3/8 bull greyhound he was very hard headed but had very good preydrive and always delivered the goods iv got a bitch out of him she tends to be more obedient than he was and she works very well it all depends on the dog you have and how its trained all the best craig
she's still just a puppy! just keep her in work on her obedience til the start of next season she should of matured abit then you dont want her picking too many bad habits at a young age!