Girlfriend didn't kiss me goodbye? Any ideas why?

When we say goodbye we always kiss and hug, this time she just hugged me... she seemed normal enough, a few minutes before she made a comment about me shaving my beard saying I look like a baby without it and she is going for her driving lesson so I told her not to be nervous she'll do great

She hugged me and said bye I don't understand why she didn't kiss me... she didn't even allow me to have time to kiss her
Girlfriend didn't kiss me goodbye? Any ideas why?
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