Girl says I'm too old, not sure if she's joking or serious?

I turned 21 a few months back, she's 17F. I met her online in a game a few weeks back and we've been talking since. I really like her. Today I asked for her Snapchat. Not sure how to proceed after this interaction.

Before this chat she sent a picture obviously trying to look good (right angle and filter etc) wishing me a good night. This was after I sent her a selfie.

To me that makes me think she's interested, otherwise she wouldn't bother trying to send a pretty selfie after I sent her one. Right?

Do you guys think she means what she's saying? Is it possible she's just memeing or should I back off?

Thanks for your help either way!
Girl says Im too old, not sure if shes joking or serious?
Girl says Im too old, not sure if shes joking or serious?
Hard to say, wait and see
She's just memeing
4 years is too big of a gap u creep, back off
No chance in hell
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Girl says I'm too old, not sure if she's joking or serious?
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