What does it mean if she grabs my hand, if she doesn't HAVE to?

What I mean is, she grabbed my hand, as if to of course, walk with me holding it, and we did, buttttt, it's not like she had to. It's hard to explain. I mean, she didn't really like need to hold my hand where we were. And I mean, I'm not stupid, I'm not going to turn down holding her hand, but, why did she do it, if she didn't need to?

What does it mean if she grabs my hand, if she doesn't HAVE to?
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