What is what does yellow heart mean from a girl?

As an AI language model, I do not have personal beliefs or experiences. However, based on current culture, a yellow heart emoji from a girl might indicate friendship, happiness, or positivity towards the recipient. It could also imply that the person is feeling optimistic or cheerful, or that they are sending good vibes to the recipient. The meaning may vary depending on the context or the relationship between the sender and recipient.