You are not being silly! This leader obviously didn't have a lot of experience with group situations and children.
Always trust your intuition with your kids. You know their needs and habits better than anyone, and don't back down when you know that you're right.
As for her resigning...If she wants to be in a leadership position of any kind, she needs to be ready to take the good with the bad. There is always someone that won't agree with you when you are in charge of a group.
If a few parents questioning a decision (that involved their children) caused her to resign, she may have been looking for a reason to quit long before now. It sounds like she wanted to be a hero to the kids and look good, instead of being a grown up and deciding what would be best for the group and finding something age appropriate.
On another note, I saw that you do in home daycare. I did it for 2 years when my kids were small, so please don't hesitate to email me. It's a very rewarding job, but can be really difficult at times.
You're not alone and I think it's wonderful that you put being home with your kiddo's as your top priority.
I hope to hear from you soon.
D. Mally