I suspect that she may outgrow the fascination with sticks, dannyg.
Just keep redirecting her and with luck she'll lose the urge to eat them all as she gets older.
Some of our dogs still enjoy the occasional twig or small stick. Sometimes they throw the sticks up in the morning with a little bile before breakfast
but we've had no lasting damage from them (*sounds of hazel hastily running through her anti-jinx routine*
)
Bark, on the other hand, can be deadly if they start stripping it off a tree trunk or a log in large quantities. Enough bark
can cause a blockage. But generally, what they'd get from small twigs and sticks isn't enough to hurt them.