Do girls mean it when they say "miss you"?

This girl posted an upset status on FB, so I wrote ":( feel better" and she goes "I'll try, miss you!"... I know sometimes girls just like attention from guys, and I'm wondering if a girl means it when she says that, or if she just likes the attention? I'm wondering cuz all I said was "feel better" and she randomly said "miss you" when she could've just liked it or said "I'll try" or something.
Do girls mean it when they say "miss you"?
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