Her phone is having two issues:
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Texts from other phones are received several hours after they were sent when she’s away from home, texts that she sends always go through instantly. If she’s at home, she always gets texts instantly.
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Her phone keeps coming up as “offline” on some other phones.
As I stated in the title, I’m not familiar with phones, so I have no idea where to even start with this. I have done nothing more than a google search that didn’t give me any results relevant to the issues.
Maybe you can test if the issue persists with a different sim card. If not, the fault is with either the card or the provider. If the issue persists, I’d start by backing everything up and resetting it to factory settings. If the issue survives the reset, it’s most likely a warranty issue.