Shyvana lacks ganking potential, she is a farming jungler like udyr or master yi, all of them become really strong if you let them farm for 25 minutes and make the occasional gank every now and then. Other junglers can start ganking right away and puts a lot of pressure on the lanes. She is annoying after 25-30 minutes when she has some items, before then other junglers are much more annoying. If you have a jungler with early game pressure, make use of it, and punish Shyvana for farming by ganking and taking down turrets, start warding in her jungle and soon she'll be of little use to the team. If you don't take advantage of the early game though, well, you'll be facing the dragon.