What does it usually mean if a girl is suddenly dry and short when messaging/calling?

So me and my friend were actually wondering about this during a random drunk discussion. But what does it usually mean if a girl is suddenly dry and short when messaging/calling?

So for example, he said after 3 months of dating. Suddenly one day she became really dry and short with him for about 3 days in a row.

We came to the conclusion that maybe the girl is losing feelings or she's going through a tough time and just needs alone time, but what are some of y'all opinions?
What does it usually mean if a girl is suddenly dry and short when messaging/calling?
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