Hi Julie - I love Seed. She's a great little character with loads of potential. The only experience I have with chapter books are the Beast/Seaquest adventure stories my kids read when they were younger, so do bare that in mind when reading my comments. I've mostly just applied normal story telling rules to your extract
As you said you had stalled on the project, I was thinking about the impetus of your story. You have a lovely opening chapter with Seed escaping. This is active with a clear goal. But after this chapter, Seed seems to disappear from the story. We hear reported news that she keeps escaping, and short extracts of her and lion looking after the eggs.
I'm wondering if you've hamstrung yourself and the story by putting Seed into too passive a situation. She is tied to these eggs. If the eggs are about to hatch, probably about a month has passed with nothing really happening. The story has lost its drive. Even at the close of the final chapter when she races off to find out what has happened to Gummy, we know she has to get back quickly to her eggs or the the chicks will die. So she's still tied to this static situation.
Obviously I don't know where the story goes from here, and you may pull off the story arc without a problem, but being as you feel stalled, I wonder if this is the right story for Seed. She's a plucky determined little chicken, and I wonder if you need to think about her hero quest and give her a more active plot.
Remember, children have short attention spans and you need to keep the story moving to keep them engaged.
Looking at chapter two, you swap POV. I did a google on younger children's books and multiple points of view because I did wonder if changing POV in a chapter book would be too confusing for younger readers. I didn't find much, but one source said limited POV for children and just one for younger children. So, if you haven't already looked into this, I think it's worth investigating.
Nicole feels like she could be a good character. I liked her super hero comments. I think you could develop a nice voice for her. But at the moment her story seems to lack direction. She's worried about her friend, but she finds out quite quickly what the problem is. And the story doesn't feel particularly connected to Seeds. Again I think it might be an idea to look at what Nicole's quest is.
I wonder if you might have two stories here that your trying to shoehorn into one. If you want to keep them as one, perhaps you need to stick to one POV and either have Seed looking into Nicole's life of Nicole looking into Seeds?
I hope these comments are food for thought and help give you the jump start you're looking for. I think Seeds story has great potential and is well worth pursing. Good luck with it.