The type of girl that apologizes too much?

What do you think of the person that apologizes for things that shouldn't need an apology?

I met a girl and she says "I'm sorry" about a lot of things. Like her notes brushed my hand and she said it. Actually they didn't even touch me they only almost did and she apologized. And she said it when I teased her about something, she apologized and I had to say that I was joking around.

She says thank you a lot too. Like for tiny things that don't merit it, like she lets me borrow a pen, I use it, give it back and she's the one that says thank you. Doesn't make much sense she acts quite different from other girls I've met who actively tease me and try to be rude to be funny (which it is I mean it's playful). She seems to say sorry and thank you a lot.

Why is she like that?
The type of girl that apologizes too much?
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