HOW CAN I CALM HER DOWN?
I have an 18 month old rottie bitch who is absolutely fantastic tempered but does nothing but run around the house jumping at people, even after a walk.
Is there anything i can do to calm her down please?
It sounds as though your pup (and she is still a pup) needs more exercise - both mental and physical - than she is getting. She also needs daily training sessions and I'd recommend enrolling her in a formal obedience class as well.
It's not okay for her still to be jumping on people, she's big enough to hurt someone or knock them down. Because Rottweilers grow into big, strong dogs it's important to begin training early, but it's never too late and your girl has plenty of time to learn.
She most likely needs two walks, plus at least one 'play' session and one 'work' (ie training) session, each day whenever possible. I recommend finding a good dog trainer locally and getting some 'hands on' help with getting started. She needs to learn that you are in charge but in a loving way, not with harsh corrections etc.
The fact that she has a great temperament means that with time and patience she will begin to understand what you expect from her, and is most likely very eager to please you. By the time she's over 2 years old she will also likely calm down somewhat naturally as she will be more mature.
Hope this helps, best of luck.