Re: How do you deal with.....
Let it go. Even IF it was a reaction to something you did or did not do....that is HER problem, not your's. Kill her with kindness: treat her with the cordial respect you show all others in the dojo and that you would like to receive. Whether or not she learns from your example, you cannot be responsible for, but you will know you are demonstrating being the best student you can, which is all you can do.