Why is she doing this? Am I just Overthinking?

I really like this girl and we’ve been on two dates. She said heard I liked someone at work (we work together) and asked me who it was and I said it was her, she admitted to liking me too. The date was really fun, we laughed and joked and she would blush a lot. Recently she’s gone on holiday and she’s not been messaging a lot at all. Usually she’d initiate like daily and sometimes I would initiate too. She’s only gone to another city for a few days and apologised for replying late saying she had really bad signal where is was. But I see her online on Snapchat from time to time but she doesn’t talk to me... it’s kinda making me sad. I haven’t told her or asked why she’s not speaking to me because I don’t want to sound needy so I concluded our last brief conversation with “okay, I’m going to go get back to work, I hope you have a great time! Be safe and shoot me a text when you’ve got some free time ☺️“.

Do you think she’s pulling away because I did something wrong? I don’t understand both dates went really well and she literally just admitted to being interested in me. Please could I have your opinions?