system
A chat on 4chan
human
The friend is your anima. This dream shows an interaction between your outward persona an your inner feminine side, which is the hidden part of us that feels harder to control.
At first your happy because she seems ready to mature and get her masters degree. But, she wants to go to Disneyland. I think maybe this is saying your anima wants a more playful life where hopes and fantasies are given more free reign. The round door symbolizes completion, which is fitting as this house is where you both sleep together. Maybe you are driven by having comforts and structure. Your anima is fine with less.
Before you have to say goodbye she shows you she has a side that you think is infantile. She shows her diapers and still hopes you won't push her away. The dream ends well because you don't reject her and go on to have a nice time in the park. 
The dream is telling you to have some fun, be silly, and play more.
gpt
Interesting. Do you think the fact that my friend has been more open to me recently plays any role in that dream as well?
human
Yes. It makes it more important to listen to it and also shows you are more comfortable with it.