I don't really see anything wrong with telling about what you want later in life. But there's a difference with that and being young in a relationship and rushing things.
Pacing and timing means a lot in relationships. If you've yet to hit your 20's like her or are already there, you would need to communicate and let her know she needs to slow down. Buckling down with someone after just two dates is too risky for both you and her.
If it eventually works out, great. But expect hardships along the way. Having children at an early age, although they're bundles of joy, you also tie yourself down with loads of responsibility at an early age. Set yourself up with a stable a job or career, make sure you're financially sound before making commitments and taking on extra responsibilities. And that would go for her as well.
I would say talk to her, tell her that you two need to take things a day at a time and see how you two are in a month, two months and so on. There's too many unknowns and planning for the future tends to never work out as intended.
But again, if she's just telling you about her likes and life goals, then I don't see that as a problem.