She's given you a clear signal.
The "dream scenario" was 100% an open approach, but you probably didn't respond positively. OTOH you must have been at least polite, because you got a second signal, so it's not a "win", but not a loss either
This:
is 100% another approach. Unlike the first one (which invited you to immediately open a discussion/negotiation), this second one isn't time-limited. So it's a natural follow-up to the first, and takes account of the fact that you might be shy (that's a positive sign).
It also avoids painting you into a corner - and along with allowing you to control the timing (if any) of any follow-up, you can also control the discussion (or at least the start of it).
Hopefully that answers the question in the title.
Naturally I'm not going to tell you what to do, but I do suggest you find out if the "dream marriage" is her objective, or if she has a less formal arrangement in mind.
If she knows you're ASD, you can use that to your advantage - say you need direct unambiguous communication even more than an NT male, and ask her if you may ask some questions.
If not, you have to declare your interest, then (assuming a positive response) negotiate the relationship, including any difficult questions.
By the way there's no need for this discussion complicated or for it to take a long time. But it should happen, and it should be
before any further steps, not after.
