If she is doing that with you so soon, she might be doing that with many others (I don't know for sure and could be wrong--again it is just so hard to judge in such a short amount of time). It seems totally valid to doubt their "love" but perhaps just slow the whole thing down in the future--wait and see and engage less rather than jumping to conclusions? I do understand that she got to your emotions in a big way in a very short amount of time. I am not sure how healthy this is. I like when people make me feel safe. Trust your feelings about this.