Im 22. She is 18. Is it bad we are texting?

So an 18 year old from work said I should add her on snapchat because she is "hilarious". But she hasn't posted anything on her story and then we just ended up texting until 2am in the morning. Her Mum also works with us at the same place.
Im 22. She is 18. Is it bad we are texting?
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