Why does she keep turning on and off her snap location?

So my girlfriend of 9 months used to always keep her Snapchat location on but lately she turns it off and it stays off for a long time. She only appears on it a few times a day! We are in different cities and it used to give me comfort knowing where she was and I haven't said anything about it as that will only end in a row obviously but is this behaviour normal? We get on really well but lately this has been giving me a lot of anxiety!
Why does she keep turning on and off her snap location?
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