Give her a dose of Rose Food in the spring. She's probably decided roots are more important than shoots this summer but she should get going next year.

Hmm, I might leave her for a bit longer then and give her another chance. If she's not back to her normal size next year, she'll be a pot rose! Thanks for the suggestion Stera.

Try threatening her - worked for me with a campanula that never flowered before.

Haha she's already been told to grow up or else....Stera, although I wouldnt mind trying her as a patio rose, never had one of those and I like experimenting.