Find my friends on apple?

so I look at my girlfriends locstion this morning (which I have been because she is home alone( just to make sure she okay) and every morning it says she is home...... but this morning it said location not available. I was kind of freaked out but as soon as she woke up her locstion was back on. How does this... show more so I look at my girlfriends locstion this morning (which I have been because she is home alone( just to make sure she okay) and every morning it says she is home...... but this morning it said location not available. I was kind of freaked out but as soon as she woke up her locstion was back on. How does this process work?
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