You should do what your heart tells you do. There is no time frame. If you are thinking of her today then text or send message. She is probably caught up in all that traveling. This relationship sounds very healthy. You should treat it as such. You are off to a good start and have a right to enjoy the chemistry that you feel. Show her that you are thinking of her without bombarding her. It's okay to seem interested. Don't fall into that trap of looking overzealous. If you feel that you like her tell her so.
I would leave some room for her traveling this week but text or call if that is what you want - and it is
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