Developing situation?

So, one of my tutoring appointments for C# has been acting a bit differently lately.

She has gotten extra help twice on the weekends, which isn't the problem.

However, she has given off what could be signals?

Monday, she noted that she was jealous that other people were needing help and I couldn't be dedicated to just her. Even though I was still helping her, enough so that she even mentioned it to her sister on the phone.

Then, Saturday for the weekend tutoring, I remember she was disappointed that we didn't eat out somewhere.

Another possible sign occurred Friday after tutoring she requested me to walk her to her car, and then apparently we are now on a hugging basis (hugging is fine with me, I do it with a lot of people).

The last one I can think of though is the most troubling. She stopped working on her stuff Monday when I had to leave, and then walked me out to my car on the way out and gave me a goodbye hug. The most disturbing part though was when asked where she was going by another student she made up an excuse.

I really hope this isn't becoming a situation. First of all, I am clueless about when it would be. Secondly, I hate having to have the "talk" about my decisions with girls. Third, she's a toot, as Nick likes to call the tutored students, and I'm the tutor. That's to me like student teacher, and I don't cross that line.

Then, I just got this email as I was finishing typing this up:
"Just wanted to say hi, hope you're having a great day!"