hmm.... you told her and she answered writing?? or you wrote her?
I don't know... "we have a good foundation for a more meaningful relationship and I'm interested in pursuing it further" does not sound like "I love you I love you I love you, I'll do anything for you, please trust me" I mean, it sounds quite... reasonable... but not very passionate. I would not want a man telling me such a formal thing!
But that's me, please don't take it that seriously. maybe she's very different from me. Maybe she has doubts wether you really love her? So my suggestion is, tell her
really. With all your passion. Really try. Offer her flowers and invite her on a real date. Take the risk. You have not much to lose...
If she says no again, you'll have to accept it. It's her decision. Accept it no matter what. That's elementar respect.
The LoA always works. If used correctly, you will attract the kind of person or the kind of relationship you want. But sometimes the perfect partner is not the one we think it is... So you should concentrate on what kind of person/relationship you want, rather than on this specific person. Erin wrote about that, look at
this.
One more thing: I said "if used correctly" above, because you will always attract what you are concentrating on. So, if you concentrate on her rejecting you, you will attract more of this rejection. If you concentrate on being rejected generally, you will go on being rejected. Never focus on the lack of what you want!
I recommend you to read
Ask and it is Given if you haven't yet
edit: oh, just seen what you edited... sounds like my advice of really trying wouldn't be very smart after all
I don't know, I'm not an expert for relationships, lol...