You did the right thing to remain vague while you figure out your feelings.
I would think hard and twice before telling her if your feelings are turning romantic towards her since if she does not feel the same this could ruin your friendship.
Take her advice and think about what you are saying and what the consequences will be before you say it.
If you have romantic feelings towards her look for clues that she feels the same before you say anything.
I have been in your position a long time ago and I made the mistake of revealing my feelings and losing her as a friend so I am not giving any advice. I am just saying be careful and sure of what you want to say.
Good luck.