What does the heart emoji mean?

Coffeeaddicts
I feel this question is silly but I really want to know what does it mean, it bothers me 🙈:
I have an acquaintance (almost like a friend but I’ve just met her so I won’t call her a friend yet) she sent me pictures of foods from a restaurant that I mentioned to her before and along with emojis like 😋😋 So the only right way for me to reply is “let’s go” she replied back with a heart only.
I like to hang out with her, and we already went out together, but what does she mean by using the heart.. is she up to that so I should fix a time for it, or just like thank you.
I’m the type of person who likes long texts so I really don’t get what does people mean with their emojis?
What does the heart emoji mean?
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