With all puppies no matter what the breed is the agility equipment is best kept at a low height until you can be sure that the growth plates are properly closed. So as long as you don't raise the jumps from the 8-12 that they are currently at and you don't jump her every day she should be fine.

In the classes at our work we don't start raising jump heights until we get to the more advanced level classes, just because by then we have already weeded out the people who aren't serious about the sport and usually by the time the dog reaches that level of class they are able to handle their proper jump height or a height or two below. Personally speaking I most likely won't start jumping Kizmit at anything close to his full height until he's past the 18 month mark, mainly because his full height is going to be around 26" or so for competition.