Given the circumstances and the fact that your W is aware that this is important to you, I would hope that she wouldn't make empty promises in this area.
If nothing happens or if she rejects your advances, I would see nothing wrong with you *lovingly* mentioning your disappointment because you were so excited that she was interested earlier.
I would not recommend that you temper your enthusiasm or excitement. You have good reason to be delighted. Trying to suppress your excitement wouldn't be authentic. And, a good mood is always beneficial as you approach your encounter.
Even if she doesn't come through, she did "initiate," so there is still something to be happy about.
Whatever she has in store for you, I would not expect anything in particular and just let her lead... for a while anyway. Just be ready and willing!
