I haven't been keeping up-2-date on your current situation but from what I've read and from past experience I have some input.
During the summer, I was dating a guy named Jack. Ironically enough his sister was dating my cousin, and they have plans to marry and live together, so even if things had of worked it would have been awkward as ass. Ne way that's getting off topic. We were in love and had plans to marry as well, much like you. I'm the type of person who isn't afraid of committment but doesn't like to be overwhelmed with it so I totally understand where she is coming from. About 5 months into the relationship Jack started to get clingy and I felt smothered, and that I was in a corner so I backed out. He really wanted to try things again and said that things would change but after going through that it was clear that we just weren't meant for eachother, although he feels we are and continues to do so. What I'm saying is that as much as I hope things work out for you and your beau, I can't help but think that she won't reconsider, mainly because I know where she's coming from. My best suggestion is don't rush things, and do as she asks become close friends. Basically start out how you were before, and be sure to keep all clingyness aside, because that will just scare her off. Goal? Become friends and then whilst doing so try and make her see what's there.. the inner spark if you will with the goal being to turn the spark into a heated connection once again. If the flame doesn't re-ignite itself... then it wasn't meant to be.
**Best Of Luck**