Dating

What to do when girl I'm dating ignores my text all of a sudden and pulls away?

This girl I've been dating (going out and hooking up for over a month) all of a sudden ignores my text message and pulls away and becomes distant while on vacation. I know she is always on her phone and online. To give some context, she's the one who always initiates the conversations as I mainly use text to set dates. But recently she has been texting me everyday and to not be rude, I would always respond but take my time. I don't know what I should do in this case since I gave her one of my silver necklaces and I don't want to lose that as it means a lot to me and I gave it to her. I have other girls as options that I can talk to but ideally I want this girl to work out. If not, I need to give my necklace back at least. Please help (I haven't double-texted nor reached out since she's gone cold).
What to do when girl I'm dating ignores my text all of a sudden and pulls away?
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