A woman gave me her contact details and I responded to her with a few days’ delay. Is this a big deal?

It was a Chinese woman I saw during a holiday. I could not download the messaging app she preferred while abroad. I set the app up after returning to my home country a few days later and contacted her. She accepted my friend request, but has been completely quiet for days on end after that. What might she be thinking?

A woman gave me her contact details and I responded to her with a few days’ delay. Is this a big deal?
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