You're welcome! And congratulations on finding that little secret!
That's what I think is nice about the RPG Maker software is that anybody can do it. All it takes is a few months getting comfortable with using it and then once you are used to working with it, you can start making things pretty well. Don't be surprised if it takes a few years though to make a decent length game, especially if you're going at it by yourself rather than with a team of folks. A lot of hours creating goes into even short game experiences, and it seems daunting when you try to look at the whole thing before you start.
I'd say the important thing though is to enjoy your time creating whatever you envision, and just focus on what you're enjoying in the moment! String enough days like that together and before you even know what happened, you'll have a game. Passion and persistence are really the secret ingredients for making it all come together. Keep it fun though too! It doesn't have to feel like work, though some days it might. Also remember to give yourself rests too, especially on days when you really aren't feeling motivated or creative enough to make progress. Forcing yourself too much during times like that will start to come through in what you create, and you might feel unsatisfied with the end result in the long run. It's okay to rest, even for long stretches of time if you need it, just stay the course and keep at it little by little! That'd be my advice in a few paragraphs at any rate!
Anyway, back to your comments. I had to make at least one way into the mansion that didn't require any condition to be met so it could be used no matter what took place in a given playthrough. The way this game was designed, because each person is able to play the game a bit differently, there were a lot of possible ways to experience the sequence of events. Possibilities also include things like skipping characters entirely if people just happened to miss them, and other situations where your options for entering into the mansion become restricted. It goes without saying that it would have been a bad experience for players and a poor design oversight to get stuck in the game with no way in or out of the mansion from no real fault of their own.
That last bit of your comment sounds a bit unusual... it might be a bug and I'm curious to know more about what exactly you're experiencing there. Once you have both the Princess Doll and the Tiny Dragon curiosities in your possession, it should play out the scene properly when you pick up the toy soldier using your sense abilities during the encounter. It sounds like it's not doing that for you however. What are you seeing after the dragon disappears? Does the game act like you haven't gotten the Princess Doll curiosity at all?
Off the top of my head, I'm wondering if it has something to do with the fact that you partially progressed the scene before having the Princess Doll, then went back to get it, and now it has perhaps messed up the event's usual progression somehow. I was fairly certain that I accounted for that sort of possibility in the way I set it up, but it's possible some issue eluded my testing. Any other details about what exactly you're seeing and doing during that encounter would be helpful for me to try and narrow down the possible issues.