Before things soured we were great together.

You're only 23, and she's been completely dependent on you since the very start to get out of her toxic family situation, and you really quickly added a child to the situation as well.....she's never really had the chance to grow, figure out who she really is...

I wouldn't call it pressuring considering I was going to marry her regardless.

Under healthy circumstances, you would have most likely given it a few more years... you have zero idea if you're still going to be compatible moving forward.

but I don't think she realizes the ramifications of doing that.

She might know that it will mean that change is coming her way, but she might simply not care.