Not at all, she can be, she is very eager to please, in all honesty she isn't like a terrier at all. Has a good nose, can take a directional retrieve (not perfect). She doesn't push on far, but is keen, pretty hard and built like bull for what she is. She is 14.5" tall, just come out of her first season. She wasn't digging at the holes or making a nuisance of herself ferreting.
My dad has her litter sister, 13" and a much better worker in terms of what you expect a terrier to be, she has started to go to ground, mine is showing no interest. I think they complement each other nicely when bush