((((((milkyway)))))))
GAH! I soooo relate to your post. My T and I were really close and I can't tell you how many times i wished (and still do wish) that she was an active part in my life - esp like a mother figure.
IMO, I'd try telling her how you feel. Maybe not being like "I love you" etc etc, but try explaining how much she has helped you, and acted like a supporting figure in your life. I'm sure she wouldn't be scared or think you are a freak or anything. If you feel this way towards her, then there probably is a good connection between the two of you, and those things work both ways my friend.
Best of luck, and try not to feel bad about how you are feeling ... its completely normal.
Jacq