She's fishing for compliments, what does it mean?

This girl I like, and who I think likes me, is always saying she looks trash around me. Some examples: When she posted a photo of me and her together on Instagram, she said she looked like trash. She sent me a snapchat of her for the first time, but scribbled herself out. When I asked why, she said its cause she looked like trash. I told her she didn't, and she replied with, yes I do. I have posted about me and her before, so if you need more details, check my other posts. Is she trying to see if I like her by asking for compliments? Or something else? What should I do differently next time?
She's fishing for compliments, what does it mean?
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