When she is unsure of whether the Allens would extend their stay by a fortnight, Catherine gets agitated at the thought of not being able to see Henry any longer. What this additional fortnight was to produce to her beyond the pleasure of sometimes seeing Henry Tilney made but a small part of Catherine’s speculation. Once or twice indeed, since James’s engagement had taught her what could be done, she had got so far as to indulge in a secret “perhaps,” but in general the felicity of being with him for the present bounded her views: the present was now comprised in another three weeks, and her happiness being certain for that period, the rest of her life was at such a distance as to excite but little interest. Ch.17

Catherine even goes so far as to start thinking that she and Henry may get married, but she is happy in the moment enjoying Henry's company.