I think the question we're all asking is she "the girl" or "a girl who might be interested in hiking with me".

The answer to your question depends on the answer to this first question. You don't leave "the girl" to go on an outing she wishes to attend, but is not ready for. You can do that with "a girl who might be interested in hiking with me".

You may not know the answer to this question yet, but it is the independent variable here; the answer to your question depends on it.