She doesn't ask how my day is anymore... losing interest?

Me and this girl have been dating since beginning of summer. She's on summer vacation at home so we can't see each other., but we make sure to talk everyday. Lately she's been busy but when whenever we talk these days she doesn't seem all that interested in what i do. Usually she'd ask how my day is, but none of that recently... what can this mean?
She doesn't ask how my day is anymore... losing interest?
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