I'm so glad you like Primal Planet so far!
Sorry that the game crashed on you multiple times. I'll look into seeing what might cause these crashes. If you have any extra information about when and where the game crashes it could help to figure out what's wrong. If you don't mind sharing your pc's specs, that could also help a lot, thank you.
The browser version isn't as stable as the desktop version, so you if you want you could dowbload the demo from Steam and try it out: https://store.steampowered.com/app/3260600/Primal_Planet_Demo/
Thanks for letting me know!
Oh and yes, there isn't much of a difference between carrying your daughter or not. I did consider making it so that you have to manage your daughter in a similar way you described, but I decided to try to make your companions as little of a hindrance as possible instead. I kinda like the idea of having to manage your daughter, but it might cause all kinds of annoyances.