Ah, true that. Still, it would have been nice if it was Ducky who reminded Chomper about the velociraptor or something. She just seemed superficial in the end, being I think the only charater who didn't end up rescuing somebody else in the whole episode.
I think the only reason why Ducky didn't end up convincing Chomper to do anything during that episode was that Chomper needed to learn on his own what he can or can't do at his current age. The fast biter kept making teasing comments about Chomper being small and unable to help anybody, but in the end Chomper is the one who comes out as the bigger sharptooth by helping him get unstuck from the rocks. This episode most likely sent out the message that evenif you are small you can still do big things, and Chomper needed to learn this on his own, just like Ducky learned in the first episode when she screamed in the Cave of Many Voices to scare Red Claw away.
Overall, Ducky is definitely a loveable character who is the purest form of a child. She always thinks about others before her and is always so kind and gentle. She definitely has a bond with Petrie, always comforting him every time he gets scared.
In my opinion, Ducky also has a dark side hiding underneath her cute innocent nature. The first we saw of this in my opinion was in LBT 8 when she really got mad at Spike after Cera taught her how to be mad (the song was pretty annoying). Then we saw it again in LBT 11 when the others were really pissed off at Littlefoot about the incident with the tiny longnecks. She always seemed to follow the idea that friends should never really get angry or fight with each other, however she ignores this when she yells at Littlefoot. She even becomes a little selfish when she makes the comment that she didn't get a tree sweet (although she countered this with including everybody else in the valley)
The biggest sign of her dark side was definitely in the tv episode "Search for the Sky Color Stones". After searching in the cave for a long time, Cera and Ruby are unable to find any stones because Ducky has already found them all and is keeping them for herself. Since when did Ducky become so greedy? She was even willing to risk her life for the stones when she was hanging on a ledge and all her stones were falling. Although Ducky is 99% the sweetest character of them all, the remaining 1% contains a much more darker side to her.