What are some signs long-distance girlfriend is losing interest?

Anonymous
We've dated for a good 2 months before she flew back home for the summer. We're university students. I'm working so I don't really have the time/money to pay for flights to visit her. She's sometimes hot/cold, so it's hard to tell...
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One thing I've noticed is that she's stopped asking how my day is, etc... She's also been busy, not anywhere with internet, so we've haven't really been able to talk too much.
What are some signs long-distance girlfriend is losing interest?
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