@valarmorgoulus,
You're still talking about very small periods of time.
In any case, consider apologizing to her about changing the tire against her direct request.
If/when both of you are feeling more relaxed, take some time to talk about her plans for the next year.
It's already going to be stressful with Remembrance Day, Thanksgiving, Christmas and New Year's in the period between now and when she leaves. Try and make the time together as relaxing and stress-free as possible for both of you.