That depends on how it was said. If she waved her hand in front of her face or fanned herself while looking at you, she likes you. If she just said it like a whisper or to chat, she's may or may not like you.
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She could be expressing that she feels physically warm, which could be due to the temperature in the room, or she might be referring to feeling attractive or confident in herself. Clarifying with her would provide more context.
It means she is horny and having sexual feelings. Pretty much ready to have sex. Or it might be innocent and she might just really feel hot. Depends on the weather. Lol