It was ONE PAGE, there is only so much that can be but on it. And it is a clearly and A to B to C thing going on here, D, E and F may follow, but she's getting to the RIGHT NOW
A. Wedding symbolizing commitment. Reasons it is a Western Wedding; 1. TOM does not know what an Amazon wedding looks like, nor do alot of READERS. 2. Shows she has HIS feelings in mind the HER fantasy. It's her dream that's not just all about HER, it includes HIM as an active participant.
B. Pregnancy comes next, showing she wants HIM and she wants a FAMILY. She does not want him as a sperm bank, she wants wedding and a baby WITH him.
C Baby. Logical conclusion to being pregnant and it gives Tom something to attach to if does want it was well. Tom is shocked and entranced by the baby enough without having her show him the REST OF THEIR LIFE. "And here's where I think she'll go to university..." would not work.
Also, what you say you want from her imaginings, is basically (you may disagree) what they have NOW. They fight and work side by side already, why should she show him that?